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Imagine a busy port city with hundreds of ships in a medieval setting without gun power. The city is not heavily walled, and is located on a remote corner of the world, away from the jurisdiction and protection of the Empire. The city is a bit smaller than Amsterdam and it's northern, western and eastern sides are surrounded by a sea. A stretch of land to it's south connects it to the rest of the continent (think of the heel on the boot of Italy). The city has a small barracks and city guards with a small naval fleet to protect against pirates. Lets say the amount of guards and soldiers is 500 (is this number too low?)

Is it believable, or possible, for an enemy army to successful conduct a sneak attack on land to the city without warning? What would the enemy force need to execute in order to interfere with the personnel of the city from relaying an impending attack? The land leading to this city is mostly green with some hills, but no mountains. This army does not have access to ships of their own, and travel on horseback. They total somewhere between 500-1000 men (is this too little or too many?).

If relevant, the attacking army has magic which can manipulate minds, but the access to this kind of magic is limited.

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    $\begingroup$ Welcome to Worldbuilding.SE! We're glad you could join us! When you have a moment, please click here to learn more about our culture and take our tour. Please note that this Q is impossible to answer without a full dislosure of technology, the landscape, the city layout (and surrounding area), the composition of the attacking army, and your full magic system. Without it, this could be closed as unclear what you're asking or too broad. $\endgroup$ – JBH Sep 5 '18 at 20:07
  • $\begingroup$ Hi, thanks for the welcome. I'm trying to keep the magic out of it and think about it purely on a military point of view. The port city is in the far eastern reach of the continent, while the rest of the Empire is to the west. The city is at the tip of a outstretched mass of land (think of the south of Italy), and is not as heavily guarded as a normal city with walls and castles. In terms of technology, the warfare is similar to knights in armor. $\endgroup$ – Ebi Sep 5 '18 at 20:18
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    $\begingroup$ :-) Please edit your question with this info. Add further; rivers, lakes, forests, bogs, roads, rocky areas, population centers (surrounding towns and villages). What does this army need to traverse to enter the city? What can it use for cover? etc. Keep in mind that large armies are hard to hide, but without them, you can't take a large city (the size of neither you've given us). As one version of Sherlock Holmes said, "Data! data! data! I cannot make bricks without straw!" $\endgroup$ – JBH Sep 5 '18 at 20:23
  • $\begingroup$ "Imagine a busy port city with hundreds of ships in a medieval setting without gun power:" there was exactly one such port in medieval Europe: Constantinople; and even for Constantinople, "hundreds" of ships is a shameless exaggeration. The problem is that Constantinople was the capital of an empire and was heavily fortified. Venice came a distant second: maybe "dozens" of ships. You are vastly overestimating the amount of long-distance seaborne trade in medieval times. $\endgroup$ – AlexP Sep 5 '18 at 21:56
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    $\begingroup$ This is off topic, but @JBH the quote was “Data! data! data!" he cried impatiently. "I can't make bricks without clay.” Sorry, I'm an avid Sherlock Holmes fan xD $\endgroup$ – Bwrites Sep 6 '18 at 2:31
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I do think we need more details regarding the geography of the land around the port city, but I will do my best with generalized cases.

Genuine Sneak Attack

Here I assume the enemy army wants to attack and take the city quickly, breaching the walls/gates before the city guard can mobilize effectively. To do this they will likely need some aid from geography and maybe weather. Given enough cover, either by trees, hills, moon-less night, the army might be able to get close enough such that they can close in on the city quickly on horseback and overwhelm the guards. Maybe a fog rolls in at night time, or a whiteout caused by heavy snowfall in the winter, that might provide cover, even if there is no traditional cover. Perhaps even then, the army isn't able to get close enough to surprise the guards. In that case a better strategy would be to have a smaller strike force sneak in further ahead, able to seize the gates and/or distract the guards long enough for the main force to reach the city. Even better, the strike force has already infiltrated, disguised as refugees, travelers, or via secret abandoned/forgotten sewage tunnels. A plausible scenario would be, starting a fire or riot in one part of the city, that will distract the guards, then capturing a gatehouse. They then need to just hold on to the gatehouse long enough for the rest of the army to come riding in.

Cutting Off The City

Here I assume the enemy army wants to attack the city quickly enough such that the city cannot request reinforcements via land or, more importantly waterway. Here the enemy isn't too concerned with defeating the city forces, but rather more concerned with the city calling for aid and having reinforcements drive them off before they can breach the gates/starve out the port city.

Without ships, it'd be tough to blockade the port city, but imagine the port city is on a peninsula extending into a protected bay. The enemy could then seize control of the bay's entrance/exit, thus preventing the port city from sending ships for aid, as well as send the main force to block the only land passage, effectively isolating the port city. They can then initiate a traditional siege of the city.

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  • $\begingroup$ Awesome train of thought! Given that the climate/season will be warm and summery, using the environment as a veil will be hard, but I love the idea of causing a distracting scenario like a fire. That way, the refugees who are secretly the enemy can make a move and perhaps open the gates for the rest of the army to make their move. Love it, thank you Snyder! $\endgroup$ – Ebi Sep 5 '18 at 21:19
  • $\begingroup$ Napoleon took a port city. Part of his plan involved placing cannon on high ground overlooking the port. Once the battle started the first task was to sink the ships with the surprise artilliary. It's worth noting that medieval cities were cramped. You couldn't fight in formation in the narrow streets.. or even bring the benefit of large numbers to bear. Because of this.. well trained elite infantry could easily decimate the city's defence from inside. $\endgroup$ – Richard Sep 5 '18 at 22:15
  • $\begingroup$ Battle of Toulon. Not a sneak attack.. but a good port town example. $\endgroup$ – Richard Sep 5 '18 at 22:19
  • $\begingroup$ I should have known to have researched the OG of military, Napoleon himself. I think a surprise artillery attack would be brilliant and plays well with the army's capabilities in my world. It will tie in with the refugee/distracting scenario quite nicely! Thanks Richard $\endgroup$ – Ebi Sep 6 '18 at 3:23
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Think 'flashmob'. Build up a force over time. Claim a distant war is causing refugees in small groups to arrive in the town. Attack at once, first securing the means of communication.

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  • $\begingroup$ interesting approach. It could make a sneak attack more believable if the refugees gathered in the city from before. Thanks! $\endgroup$ – Ebi Sep 5 '18 at 20:41
  • $\begingroup$ I wonder why I got -2 for this? Bizarre. $\endgroup$ – Richard Sep 5 '18 at 20:43
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    $\begingroup$ not sure, I gave it + but it doesn't count since I'm a newbie. Maybe the people from my imagined city are down voting it to prevent a devastating attack :D $\endgroup$ – Ebi Sep 5 '18 at 20:45
  • $\begingroup$ Count me in on the attack! $\endgroup$ – Richard Sep 5 '18 at 20:50
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    $\begingroup$ @Richard -- one possible reason for the downvotes is the brevity of your answer. It is entirely conceivable that someone could vote to close for that reason. If you could expand on your concept, particularly what you mean by "securing means of communication", that would be very helpful! $\endgroup$ – elemtilas Sep 5 '18 at 21:54
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Use the pirates as diversion / decoy

  1. Wait until a pirate attack and attack simultaneously with the pirates. This would split their forces and you can take advantage of their panic because they will not see your attack coming. This will also be a good pincer strategy.
  2. Make a deal with some pirates. Pay them, to act as a diversion and attack with the same tactic explained earlier.
  3. BONUS: Use your mind control magic to the pirates to force them to be a decoy. Preferably some lieutenants or the pirate captain himself because your magic is limited.

Since you overpower the port city by numbers and their strength is with naval combat, you can feed their ego by giving them what they want: the advantage they think they have.

Hopefully you have some kind of contact with the pirates because without them, the plan would fail.

EDIT: The persuasion isn't necessarily conducted at sea. Preferably when the pirates dock to some remote town to take a break. The army will not need ships to do this.

TLDR: Use pirates, split their forces

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  • $\begingroup$ lol imagine a fleet of mind controlled pirates sailing to your city. I like your idea, the only problem is the army who is attacking doesn't have access to ships :( $\endgroup$ – Ebi Sep 6 '18 at 3:14
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    $\begingroup$ Taverns doesn't exist in the sea. And pirates spend most of their time in taverns, isn't it? (Gotta have that rum, boy) Some way or the other, they need to go to the land. You don't have to approach the pirates from the sea. That's a foolish tactic. So you gotta make contact by land. $\endgroup$ – Bwrites Sep 6 '18 at 3:26
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I think we need to do some thinking about what it means to take the city "by surprise". In those days armies didn't have radio or telegraph, and they wouldn't be in a constant state of readiness. So you could be fighting with a few guards (who wouldn't be surprised) but if you prevent them from getting a message to HQ or you prevent HQ from alerting the garrison, you're still taking the city by surprise. In that sense a surprise attack is really a "head of the snake" attack -- you're trying to force the general or the prince to surrender before he can mobilize his defenders.

Given that, the kind of a ruse that you might see in a silly movie could actually work. Think of how Westley, Inigo, and Fezzik got into Prince Humperdink's castle in The Princess Bride, or how Mel Gibson's William Wallace in Braveheart tricks the English garrison into opening their gates (by wearing uniforms taken from a captured patrol). Realize that in the days before gunpowder, each fight is man-to-man. A small group of infiltrators can fight a small group of guards, take the gate, and let their comrades in. Arrive at a time when you're not expected, for example, in the winter. Before the American Revolution, armies generally didn't fight in winter but sheltered in place. Washington was able to win the vital battle of Trenton by attacking at dawn on December 26th, when the enemy simply had no expectation of possible attack and hence were not in a state of preparedness. (This was of course a desperate risk by Washington, whose troops might not have survived if they had to retreat, so that's the trade-off.)

Once within the city walls, your army's task is to get to the enemy headquarters and capture the prince or the general, forcing him to surrender. Now, if your attacking force is really small, eventually the lower-ranking commanders of the garrison will realize that you're bluffing and may re-take the city. So you have to act fast to consolidate your win, perhaps by demanding they disarm, keeping them separated, turning them to your side, getting the church to officially recognize your right to rule, or bringing in reinforcements.

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  • $\begingroup$ Smart idea, Joe. You are spot on. By altering or intercepting the message to the HQ you can in theory take the city by surprise. Thanks for your suggestion. $\endgroup$ – Ebi Sep 6 '18 at 3:12

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