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It's the modern day, somewhere in Europe. Guns are generally difficult get a hold of, and ammunition is not all that plentiful for the average citizen. The cities are death traps, and hordes of thousands, if not tens of thousands of zombies are sweeping the land, looking for their next meal.

Ion just so happens to live close by a 1400's medieval mountain fortress. Although you'd think this would be the first place people would seek shelter in a zombie apocalypse, let's assume that the zombie virus struck terribly quickly, and violently, and only a couple of hundred individuals made it within its walls.

Now, Ion is a practical guy, and he realizes that he's got everything he needs on hand to survive for a long, long time:

  • The fortress was a tourist attraction, but also kept functional as a military police barracks. Sadly, the vast majority of their equipment (guns, riot gear, ammo, etc.) is gone, but the place is set up to support a few hundred people living there (beds, mess hall, fridges, emergency generators, heating, washrooms, etc.).

  • There's an armory of medieval weapons on display for the public, and although old, most of the blades, and pole weapons are serviceable. Most of the medieval armor pieces on display are too small, worn, etc. to be used, but a few individuals might be able to armor up for some CQB zombie smashing fun.

We will be ignoring how these people are going to be procuring food, more weapons, etc. Ion has other things on his mind. The moat, though huge, is empty, and he is really worried about all those zombies roaming the land. Eventually they are going to make their way up to the fortress, and although the gates/walls will hold, what happens when the moat fills up?

Note: The moat is dry; there is no source of water to fill it up on demand (only a massive rain/snow melt might do so, and only temporarily).

Not only are the dead bodies going to cause diseases to break out, but the zombies might literally be able to climb over the walls on a ramp made of their brethren's battered remains.

And so, given that:

  • There are no construction type vehicles available to dig massive graves, or otherwise empty the moat
  • The survivors have some fuel, but not a lot of it (plus, they will need it for the generators)

my question is:

  • How might the survivors keep the moat from filling up with dead/undead on a day to day basis (say 10-30 new zombies fall in)?

  • How might they deal with the aftermath of a massive zombie wave which ends up leaving thousands of dead/stuck zombies behind in the moat?

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    $\begingroup$ To my mind, the gates are your weak points. Most real castle fortresses that feature a moat have thick steep walls on the inner side of the moat. Even the few windows were, by design, too narrow to climb through. Dourdan Castle shows this well. As long as the castle has a good portcullis, defenders can shove spear and rod through the zombies' heads safely from the other side. $\endgroup$ – Jym Jan 13 '17 at 19:20
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    $\begingroup$ @AndreiROM: I think Jym was getting at, if they can't get through the gates, then why do you care if the moat fills up with zombies? $\endgroup$ – Nick Matteo Jan 14 '17 at 0:36
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    $\begingroup$ Do they have a trebuchet? $\endgroup$ – Beta Jan 14 '17 at 0:58
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    $\begingroup$ Fill the moat with mercury... just kidding I mean H2SO4 or HCI etc but before that use electromagnet to pickup anything useful!😜 $\endgroup$ – user6760 Jan 14 '17 at 3:08
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    $\begingroup$ The pit will fill with methane as the bodies decompose. A spark in the wrong place = boom $\endgroup$ – nzaman Jan 14 '17 at 12:11

14 Answers 14

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If it's a Dry Moat - Burn 'Em

Emergency generators mean fuel, and fuel is flammable. At regular intervals (or just as needed), the people within the castle walls sling home-made molotov cocktails into the moat. Since the zombies do not stop, drop and roll they spread the fire to others in the trench, and eventually incinerate. It may take a few fires before a corpse is fully incinerated, but eventually it is.

At a point you may have an issue with the trench filling with ash and bones, but the basic strategy of using fire will allow considerably more zombies into the area before that problem comes up. Hopefully the survivors can find some shovels (or invert helmets) to clear out the mess on occasion. They could even use the debris to start building up another, further out wall that would help discourage zombies from wandering into the castle moat.

This plan has the additional upside of helping deal with disease.

Edit 1: As a bonus, this plan does not typically require any combative engagement with the Z's. The fire is ITSELF the means used to "kill" the zombies. Greater concentrations of zombies are more likely to start a mass conflagration and hotter fires, so let the hordes come! Guns/hand-to-hand combat is reserved for wet/rainy days.

If it's a Wet Moat - Much More Complicated

The best thing would be to do whatever is possible to dig some kind of a basic water release, which would then let you get on with Scenario 1.

Otherwise, you can use the trench to slow zombies down and destroy their brains at your leisure. Using pole weapons, lift floating corpses out of the moat regularly and bring them to a storage area inside where they can be incinerated.

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    $\begingroup$ The moat is dry, unless maybe some sort of torrential rains/snows melting fill it with some water. The question then becomes how much fuel is necessary to actually burn the bodies down to ash, not merely turn a rotting zombie into a barbecued zombie. $\endgroup$ – AndreiROM Jan 13 '17 at 19:13
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    $\begingroup$ Ah, yes, everyone's favorite aroma: burning flesh. $\endgroup$ – Frostfyre Jan 13 '17 at 19:14
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    $\begingroup$ @AndreiROM - I agree that ash > charred zombies. I think the best way to handle it is based on the size of the moat and the speed at which new zombies are added. For example, if it's relatively slow then it should suffice to simply start a new fire now and again, turning fresh zombies into half-charred masses and half-charred masses into ash. If Z's pile up faster though, the people inside might find benefit in tossing more fuel (wood, paintings, etc) into the moat with the Z's to complete the job all at once. I tend to think the latter would deplete internal resources very quickly though. $\endgroup$ – GrinningX Jan 13 '17 at 19:31
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    $\begingroup$ @AndreiROM - If gasoline (etc) is in short supply, the answer is simply not to ignite the moat until it is sufficiently full. You also only have to start 1, maybe 2 zombies on fire if they're sufficiently close to one another and use fires natural tendency to spread to your benefit. $\endgroup$ – GrinningX Jan 13 '17 at 19:40
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    $\begingroup$ If it's a wet moat.... add piranha after each battle. Then once your moat is free of zombie leftovers, capture a few piranha to breed in an aquarium within the castle (in preparation for future post-battle clean-ups), and let the rest die of starvation. $\endgroup$ – Henry Taylor Jan 13 '17 at 19:46
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The zombies will NEVER get over the walls.

Why?

Physics. Zombies are basically human bodies that are still moving despite being in varying stages of decomposition. Human bodies are mostly water. We do have some skeletal structure, and some of it is very strong, but for the most part, we are bags of water. Now, what happens when you stack up enough people to make a pile of bodies as tall as a CASTLE WALL?

Pop goes the water balloons. Humans (who are living and hence, WAY more structurally intact than an average zombie) are crushed like grapes by the pressure of that many bodies on top. So what happens with rotting zombies? Probably, they would liquefy at the bottom and actually FLOW AROUND THE CASTLE like a mud flow. Gross, but they will never get over the walls.

What about the moat? It will stink for sure, but even if you don't find a way to light them on fire, the sheer tangle of zombie bones, body parts, limbs, crushed zombies, etc, will become a tangle of barbed wire for other zombies as they try to cross toward your castle. Like velcro, zombies will get stuck in there. The ones on the bottom will liquefy and rot away and the ones on the top will continue to trap more. Basically, even if you do nothing whatsoever, medieval fortifications will totally defeat a zombie apocalypse.

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    $\begingroup$ If i do "nothing whatsoever" will disease not run rampant through the castle? Also, would a massive wave of a few housand zombies all "attacking" the same spot not eventually create a pile up, even though, yes, the ones at the bottom would be crushed? $\endgroup$ – AndreiROM Jan 13 '17 at 21:07
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    $\begingroup$ JBiggs is saying that the zombies lack the structural integrity to create a pile up tall enough to get over the walls. For illustration, it doesn't matter how much soup you pour in one spot, you'll never make a tower out of it. No even if it's really thick chili - it just can't hold together well enough to do anything but flow along the ground. $\endgroup$ – Jeutnarg Jan 13 '17 at 23:30
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    $\begingroup$ @kundor - how about when pests gorge on the rotten meat, then infiltrate the castle (rats, etc.) That is exactly how disease spreads. $\endgroup$ – AndreiROM Jan 14 '17 at 5:00
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    $\begingroup$ @Jeutnarg If I keep pouring soup into a bowl it does eventually come rushing over the side... I sure hope the inside is a lot higher than the outside $\endgroup$ – A C Jan 14 '17 at 7:35
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    $\begingroup$ I agree with @AndreiROM. Zombies aren't particularly strong, but neither are they comparable to soup. Humans don't pop, bones maintain a mostly solid structure, and bodies pile anyways, as evidenced by some very nasty pictures from WWII. Even if the pile somehow .. liquifies? You don't exactly want liquid, human remains seeping into the water system, nor the land you're using for agriculture. $\endgroup$ – Zxyrra Jan 14 '17 at 15:22
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A constantly-burning crematorium

One of the towers might be re-purposed for this. During lulls, well-armed/well-organized parties would go into the moat and fetch another round of zombie fuel - that is, they would collect zombie bodies and bring them back into the castle and burn them in their zombie furnace. Massive zombie waves simply take more time. This constant source of heat could possibly be put to good use, but would be a by-product of a virtually never-ending zombie disposal effort. This solution assumes that they don't have a large supply of other fuel and are unwilling/unable to forage for more.

Edit: The 'how' is simple and is the only way they have: By hand.

Edit #2: More on the "tower" idea. The tower would act as a smoke-stack of sorts. Smoke stacks not only direct noxious smoke and fumes away from the burning, they are instrumental in creating draft, from the bottom where the fire is to the top. This helps supply the fire with oxygen better than it could draw by the burning process alone. They would have to somehow build a raised surface with holes as a burn platform. The bottom of the tower would then be the ash-pit. The accumulated ash could be cleaned out without the need of putting the fire out - round the clock zombie disposal.

Another reason to use a tower is the sheer size of the fire you would need in order to fuel it with zombies. Bodies will burn if the fire is hot enough and big enough. The massive wave of zombies would be a blessing of sorts. They would need an ample supply of dead bodies to feed the fire.

Still another reason to use a tower is that it is inside the safe perimeter of the castle. And the fire is hidden and won't unnecessarily attract more zombies.

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    $\begingroup$ Follow up questions: 1) Why would zombie bodies burn, as opposed to needing fuel to be burned? and 2) Why would the survivors burn the bodies in the castle yard? The issue here is body disposal, not heating. $\endgroup$ – AndreiROM Jan 13 '17 at 19:58
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    $\begingroup$ 1) Though animated by unknown forces, they're still bodies. They burn - especially when you have alot of them. There's an obvious (and horrific, inhuman, etc) historical real-world example of this. To your point, they don't burn spontaneously - the fire must be started with something else. But once going, the zombies themselves become the fuel. 2) Inside, it's secure. You wouldn't start a fire outside because it's not secure and the fire would draw more zombies. $\endgroup$ – Jym Jan 13 '17 at 20:23
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    $\begingroup$ I you're clever, you can design it so that the zombies will walk in under their own power. $\endgroup$ – Beta Jan 14 '17 at 1:00
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    $\begingroup$ human bodes contain enough fuel to evaporate their 75% water content. zombie bodies will likely burn too. $\endgroup$ – Jasen Jan 14 '17 at 5:21
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    $\begingroup$ @AndreiROM No need to go outside to get the zombies.. Just a rope and grappling hook and go fishing for them from the safety of the wall. $\endgroup$ – Tonny Jan 14 '17 at 20:11
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Start a vulture farm.

I'm not sure how your zombie virus affects vultures, but vultures are biologically developed to eat rotting flesh, and would probably do a slower (but better and safer) job than a pig farm would. Simply let them out to eat every day and they'll likely go straight for the dead zed at the bottom of your moat.

How your survivors get their hands on and train the vultures is a different problem.

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    $\begingroup$ In most situations, vultures and other carrion birds will find you, and their presence will attract even more carrion birds. I've seen dozens of birds (not full vultures, but not small by any means) circling above a single dead deer... imagine the flock that would come for a banquet like a moat full of carcasses. As far as letting them out or taming them... no need. Just provide a place for them to nest/roost and they'll handle themselves. $\endgroup$ – Jeutnarg Jan 13 '17 at 23:23
  • $\begingroup$ @Jeutnarg That makes this answer even better than. Providing a tower for them to nest and roost is simple. $\endgroup$ – Aify Jan 14 '17 at 6:26
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    $\begingroup$ Traditionally done: en.wikipedia.org/wiki/Tower_of_Silence $\endgroup$ – nzaman Jan 14 '17 at 12:04
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    $\begingroup$ The problem is that human population is huge compared to any other large vertebrate, carrion birds included. So there is too few of them to make a significant dent in a wide-scale zombie apocalypse and they would take years to reproduce in sufficient numbers. The main burden of disposing of the zombies would fall on different animals. Unfortunately its the animals you would be least happy to see: flies, especially flesh flies and green bottle flies. $\endgroup$ – Jan Hudec Jan 14 '17 at 14:33
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    $\begingroup$ … Flies could probably deal with the zombies in a matter of a few months, but unfortunately the swarms of them would contaminate everything with traces of the rotting flesh, spreading the zombie virus (if we are talking about the common virus-type zombie apocalypse). Of course if the virus is so contagious that majority of population was infected in a couple of days, the survivors are probably those who are naturally immune for whatever reason, so it may not matter that much. $\endgroup$ – Jan Hudec Jan 14 '17 at 14:37
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You could try some medieval tech to go with your lodging...

I'm thinking you could use an oversized trebuchet, or perhaps a few trebuchets to launch zombies a fairly long way away.

With this trebuchet you could launch 1500lbs a little over 100ft, so that would be say ten 150lb zombies out of the moat and likely pretty well smashed upon landing. Or one zombie much further...

  1. Build your trebuchet
  2. Raise your counterweight
  3. Lasso a few zombies in the moat
  4. Lob them out
  5. Rinse and repeat

Here's a little inspiration, if you have doubts about throwing heavy objects long distances

Also...

It's a trebuchet... so you have the option of throwing all sorts of fun things at approaching zombies. Think of it this way, instead of 2 birds with one stone, you get 10 zombies with one throw, plus however many zombies you manage to hit.

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    $\begingroup$ While the most entertaining idea I've heard yet, I'm not sure as to its practicality. Idk anyone who knows how to build a serious, large-scale trebuchet with nothing except raw logs, and rope. Furthermore, firing it over and over again seems like a really slow process. $\endgroup$ – AndreiROM Jan 13 '17 at 23:04
  • $\begingroup$ @AndreiROM why would you need to build it out of raw logs and rope? $\endgroup$ – apaul Jan 13 '17 at 23:09
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    $\begingroup$ @AndreiROM if you're in a post apocalypse situation I'm sure you could scavenge up nicer modern building materials. If you have water and power reloading could be made much faster as well. $\endgroup$ – apaul Jan 13 '17 at 23:12
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    $\begingroup$ Furthermore, firing it over and over again seems like a really slow process. ...got anything better to do with your day inside that castle for the rest of your life? Besides, as you said, it's entertaining. It could start a friendly competition/sport. $\endgroup$ – xDaizu Jan 16 '17 at 7:54
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It must be acknowledged that the moat cannot be cleared quickly. The question of "how to empty such a moat" is really difficult to answer, because it takes manpower, involves exposure to diseases, and more.

You must turn to solutions that prevent the zombies from reaching the moat in the first place.

Remove their incentives

Depending on how your zombies work, they may require certain stimuli to detect prey - such as sound and visible light. Make quiet mandatory, enforce curfews, and block all possible lines of sight. The risk of a pileup is significantly reduced if they can't tell you're there.

Far-range barriers

Working in tandem with my first suggestion, create a system of walls, trenches, and / or other barriers a good distance away from the actual castle - far enough to prevent any zombies from getting close enough to know you're there. They do not need to be strong, because they will rarely, if ever be besieged. As long as they can't accidentally be breached, but they're strong enough to keep things out that bump into them, you're good to go.

Bar the roads

The road is your best friend, and your worst enemy. It allows supply runs, but it's also the easiest path for any invader. Establish checkpoints / gates along the road - they don't have to be manned, as long as they can be unlocked or surpassed by vehicles - that would prevent massive swarms.

Moats further away

If you have sufficient manpower (and time), consider war-style moats. These should be outside the castle walls, and outside of any agricultural land, but inside the far-range barrier; they will catch many invaders on the way in, but less invaders each, and there won't be a ton of pressure to clear them out.

Upturn the castle walls

Now, in the unlikely event that zombies (a) reach the main moat and (b) pile up to a climbable height, your only concern will be disease. Having a wooden ledge or overhang above the walls will prevent direct climbing - or at least postpone it for a very long time.

enter image description here

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Institute pole duty among the inhabitants. In shifts, the people on pole duty walk around on the battlements with long poles (eight feet is long enough). They use the poles to push back any zombie who is on a pile high enough to reach the battlements. That zombie falls and gets even more damaged.

Soon there aren't enough intact zombies to form a pile that can reach the battlements.

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Burn them when the moat fills.

Send teams to get wood, wood, and more wood. Take every square inch you have to cure the wood so it burns better, rotate the older wood out. Since the moat will take time to fill, this should buy you time to collect wood.

When the moat begins to get to a point where it's getting dangerous, drop all the wood and some fuel to get it started, keep dropping wood from the walls to keep the fire burning until there is nothing but ash left.

Eventually, your stockpiles of wood will become massive enough, and dry enough that you won't need fuel to get the fires started, Also, tar and soot will build up as well, and make the fires easier to start and maintain. Pine burns quickly, and is good for starting fires, Oak burns hot, as does cedar.

The difficulty would be in the logistics of cutting wood and retrieving it. If raiding parties could be sent to villages, houses and furniture could be cannibalized.

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There IS NO moat

enter image description here enter image description here enter image description here

Proper mountain castle doesn't need no puny moat. No moat can beat tens of meters vertical rock walls on one side and absurdly steep climbs on the other - if they climb up to the wall, give them a push and watch zombie dominoes. This incidentally makes it a terrible place for military police garrison - no easy road means you can't get out to police anyone easily, but that's entirely different problem (solvable if you replace MP with border guards and place your castle near some border - rough terrain needs to be guarded and patrolled all the same, and castle near border would make a good place for active duty border guard barracks, in fact, due to difficulty in using vehicles, you probably need more people than on flat terrain).

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  • $\begingroup$ It's not a mountain castle in quite as dramatic a sense as you are depicting here. The moat is a fact, as stated by me. Also, who said that there's no road? Idk what's driving you to make all these assumptions. $\endgroup$ – AndreiROM Jan 14 '17 at 20:43
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This would require some engineering and planning, but what if -just what if- this mote wasn't used to keep the zombies out? What if it was used like a trap? A temporary holding cell?

There are two huge concerns that could be addressed here; disease and energy. Burning the zombie corpses in a controlled manner as a fuel alternative could have many great benefits. In the Winter, the corpses could help to provide heat throughout the castle, much like a boiler / furnace. In the Summer, there may some steam capabilities (although an abundant water supply may be a different story).

Frequent burning as an alternative fuel source may not solve the problem entirely, but may alleviate it. The mote could be altered to funnel traffic into 'kill zones', where trained teams using melee weapons with extended range can kill them and recover the corpse safely (perhaps using some sort of hoist mechanism).

On another note, I think that attempting to conduct controlled burns in the mote could have potential for devastating consequences. An out of control fire could find it's way inside the castle walls, then you have a real problem. You also probably don't want the bodies to continue decomposing into the soil so close to the castle. Eventually that will contaminate the soil insides the castle walls, and thus affect agricultural efforts.

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  • $\begingroup$ Some pretty interesting insight. $\endgroup$ – AndreiROM Jun 16 '17 at 0:18
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Re purpose the armor and chain mail to make bite proof suits and go out and render the zombies down for fat fuel! the danger and gross factor would make it a good punishment for the slackers in your little community.

Ok, I'm not really sure how that would work, but lard burns and that kind of fuel could be used to start some good conflagrations in your moat to occasionally clear it. The Z-lard could also power boilers for heat and maybe power generation without using up precious supplies of Gas or Diesel

Also, can you imagine the reputation you could gain if you could say that your castle was powered by the fat of the damned :-)

Of course all of this depends on the transmission vector of the Zombie bacteria or virus or whatever.

For something more practical, depending on what minerals or other materials you have available, you may want to sprinkle a corrosive into the moat on a regular basis to speed up the decomposition of the zombies in there. If it's sufficiently caustic, it may also reduce vermin populations and the problems that go with them. Lye is very caustic and can be produced from hardwood ash. Lye is also used to help produce biofulels for other purposes. Back to powering your castle from the fat of the damned maybe?

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Put in a ramp so that zombies that fall in can walk back out. While a moat can be a good deterrent against human adversaries, it is a much less effective barrier against zombies. A sufficient number of zombies can easily fill up a moat given enough time. Even un-motivated zombies can fall in accidentally. If the goal is to prevent this from happening, then the easiest way to do this is to give the zombie a way to leave on their own. Depending on the moat design, a simple wooden ramp should provide an easy exit. While zombies are not particularly durable, the don't feel the pain of injuries and most that fall in should still be ambulatory enough to continue walking or crawling. If there is no stimulation drawing them to the castle, then they should eventually discover the ramp and wander away following some other sound or smell. If you are lucky the geography around the castle might provide a convenient entry and exit for the zombies. For example, if zombies tend to always approach from one direction and fall in, you might put the ramp on the far side where they might walk up the ramp and tumble down a hill, unlikely to walk back up.

In addition, if you would like to speed the exit of the zombies you might provide incentives for them to keep moving and exit on their own. This of course may depend on the type and motivations of your zombies. For example, if the zombies in your land are attracted to sounds it should be a simple matter to place something that produces noise near the top of the ramp like a bell that would draw zombies in that direction. You could further rig it so that when a zombie walks on the ramp it rings the bell drawing the zombie forward and attracting more zombies from the moat towards the ramp. If the bell is not too loud you can avoid attracting zombies that are not already in the moat from further falling in.

Some zombies that fall in may become too damaged to leave on their own, but this number should be greatly reduced. Zombies that become damaged and stuck in the moat would likely be trampled and ground into the earth by the "healthy" zombies but since this number would be much smaller it would likely never fill the moat.

If a zombie hoard arrived, the trick is to keep them moving. When members of the hoard fall into the moat they should follow a route around the moat until they reach the ramp, and then climb the ramp and continue right on out the other side, or hopefully tumble down your hill and keep walking somewhere else.

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  • $\begingroup$ This does provide an answer. Questioner asked how to keep the mote empty. Zombies that fall in the moat will eventually fill it up. Giving zombies a way to leave on their own means that they will leave when they get bored and the moat stays empty. $\endgroup$ – Zack Apr 16 at 21:36
  • $\begingroup$ Hello Zack. We do tend to react poorly to one-line answers. As in this case, they rarely contain enough information to justify the answer. The OP did not mention access to heavy equipment, like earth movers, so building the ramp sounds implausible. Once the ramp is built, unless the wall of the moat is tapered all the way around, convincing mindless zombies to walk back up it sounds happenstantial to the point of impractical. If they don't walk back out fast enough, the problem the OP is facing still remains. Can you improve your answer? $\endgroup$ – JBH Apr 16 at 22:53
  • $\begingroup$ Good out-of-the-box thinking, but not really the optimal answer in a zombie apocalypse. 1) any zombie that walks out is still a potential threat to the survivors. Zombies who attack the walls and fall in the moat are, at least, trapped. 2) A large horde will, eventually, find its way there, at which point it's better if zombies fall in and are crushed by subsequent zombie victims. The question was not how to keep the moat empty at all times (which would serve no real purpose), but how to empty it once it's full of zombies. $\endgroup$ – AndreiROM Apr 18 at 13:41
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The moat could be part of a river system, and have a strong current. Imagine a castle built on a small rocky outcrop in the middle of a fast flowing river. With appropriate stonework the river could be channeled around each side of the castle and have a strong and deep current, enough to sweep attackers bodies away.

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  • $\begingroup$ Unfortunately this is in the mountains, and not the case at all. The moat is dry, as I specified (i'll edit and make it more obvious in the question) $\endgroup$ – AndreiROM Jan 13 '17 at 20:00
  • $\begingroup$ Divert a river into it. Othrwise you're screwed. $\endgroup$ – Innovine Jan 13 '17 at 20:06
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    $\begingroup$ castles are not built away from a source of water, ever. and very many are on a river since it aids defense, and transport/trade. if its big enoug for hundreds and been used as a military base, it has strategic positioning, again, likely a major waterway. you generally don't put a major military base on the top of a mountain with steep steps $\endgroup$ – Innovine Jan 13 '17 at 20:07
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    $\begingroup$ Castles may have a well, but not necessarily access to a river. Look that up if you don't believe me. $\endgroup$ – AndreiROM Jan 13 '17 at 20:09
  • $\begingroup$ castles built on top of mountains tend to use the terrain to improve the height of the walls, and lack a moat (st johns bastion in valetta being the only example I can think off offhand which is raised (not much) yet has a dry moat). $\endgroup$ – Innovine Jan 13 '17 at 20:14
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World War Z (the book) covered this pretty well. The Queen refused to leave Windsor Castle, because she would not abandon her country. There are suggestions that other castles around Britain were also used as strongholds. As a result, the Brits became experts with the medieval weaponry which was hung all round these castles for ornamentation, and mostly switched away from using firearms.

Brooks gave some serious thought to how you fight zombies and how soldiers would be trained. The key realisation was "Zack ain't in no hurry, why are you?" So long as you can see them coming, you just need to pace yourself and keep knocking them off. Zombies climbing up a ramp of other zombies are never going to get to you quickly.

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  • $\begingroup$ Hi, yes, I've also read that book. Several times, in fact. Did you read my question before answering? The concern is emptying the moat (disposing of the bodies), not defending the walls ... $\endgroup$ – AndreiROM Jan 16 '17 at 14:01
  • $\begingroup$ Sorry, maybe I wasn't clear enough. Your question seemed to be asking how you'd solve the problem of a "dead zombie ramp" allowing the castle walls to be scaled. My point was that a "dead zombie ramp" is to be expected and isn't a problem for defence, because the zombies won't get up the ramp fast enough to be a threat. Unless there are other issues such as spreading disease, then emptying the moat isn't a concern. Maybe it bothers you, but it shouldn't bother the defenders. $\endgroup$ – Graham Jan 16 '17 at 15:11
  • $\begingroup$ And I quote: "my question is: (1) How might the survivors keep the moat from filling up with dead/undead on a day to day basis (say 10-30 new zombies fall in)? (2) How might they deal with the aftermath of a massive zombie wave which ends up leaving thousands of dead/stuck zombies behind in the moat?" Them getting over the wall is a concern, but not the question being asked. $\endgroup$ – AndreiROM Jan 16 '17 at 15:15
  • $\begingroup$ Your question explicitly says that your primary concern is them getting over the wall. Going from that to "how do I clear the moat?" is an absolute textbook example of the XY problem, and answers saying "you don't need to clear the moat" are clearly perfectly good answers to your question. $\endgroup$ – Graham Jan 16 '17 at 16:45
  • $\begingroup$ Sorry to say, I think it's a textbook example of you not fully reading the question. I explicitly say that not only is the outbreak of disease a concern, but also the bodies piling up. Hence, what is a good way of clearing zombies out of the moat. Don't blame me for your lack of reading comprehension. When a user explicitly states "my question is:" then what follows is the question which needs answering, not whatever tidbit of the text you feel like addressing. As far as defending the walls is concerned you're most likely correct, however that's not relevant to the discussion at hand. $\endgroup$ – AndreiROM Jan 16 '17 at 17:04

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