What would have been required for rockets to have dominated historically instead of cannons as the standard artillery weapon? There was enough of an overlap that this feels like it could have been possible.

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    $\begingroup$ At what point in history in what country? After all, they pretty much did in China, and do internationally at present. $\endgroup$ Jun 5, 2021 at 23:24
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    $\begingroup$ There are many pros and cons between cannons and rockets. But it really boils down to one thing: gunpowder rockets are inaccurate, no matter how carefully you make them. $\endgroup$
    – PcMan
    Jun 5, 2021 at 23:24
  • $\begingroup$ A lot, but higher letality for the same effort/energy used to make them and all that. It was tried as replacement of arrows, look mythbusters quite interesting case $\endgroup$
    – MolbOrg
    Jun 5, 2021 at 23:41
  • $\begingroup$ Rockets were no match for cannon before very very recent times. Sorry, but this is asking for an impossible situation. At any time before the 1950s there was no way to make a rocket even remotely as efficient at killing enemies, crumbling walls and sinking ships as a cannon. $\endgroup$
    – AlexP
    Jun 6, 2021 at 0:13
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    $\begingroup$ Rockets were mentioned in a well-known song from a battle in 1814. In 19th-century Britain, 20th-century Germany, or 21st-century Gaza, wherever the appearance of doing battle would suffice, poorly targeted rockets seemed apt for the task. $\endgroup$ Jun 6, 2021 at 7:25

4 Answers 4


A guidance system

The age of cannons is over. The age of RPG's, ICBM's and Air-to-air missiles is not. What caused this?

A cannon projectile is a stable system. Once launched from the muzzle of a gun, it's flight path is relatively predictable - it follows a parabolic arc. Sure, it's not 100% accurate due to tolerances between the bore and projectile, but it's not too bad.

A rocket is a much less stable system. If a rocket gets any angular velocity on launch could end up literally anywhere. It needs something to keep it straight. The simple solution are tail-fins. Tail fins are good, but if they are off by a degree or two you end up with rockets that fly in circles.

Rockets only really became useful after guidance systems were invented. Initially these just kept rockets on a straight line, but eventually they became active guidance systems using lasers, GPS, inertial measurement systems etc.
Once this point was hit, rockets became steerable explosive shells with longer range than cannons.

Ever notice there aren't any large bore guns on modern battleships? That's because a bunch of missiles is superior in every way except for cost. As a result battleships were largely replaced by guided missile destroyers.

What resulted in the development of guidance systems?

I suspect that rocket guidance systems largely evolved from torpedo guidance systems. Torpedos are slower and easier to control, and the first solution for guidance seems to have been in 1866 using ... clockwork and compressed air.

Could this have been developed sooner? Maybe.

What's next though?

Are cannon gone forever? Maybe not. Railguns allow much lighter-weight and cheaper ammunition, and can shoot at incredibly long ranges. I strongly suspect that guided railgun projectiles will be a major future long-range large-damage weapon.

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    $\begingroup$ Note: cannons still have significant advantages in modern times of cost, efficiency of transportation (a truck carrying rockets will hit the bulk limit of a truck way before it hits the weight limit), ability to get to high speeds (the reason APS can't shoot down APFSDS) & the lack of blackblast. $\endgroup$
    – OT-64 SKOT
    Jun 6, 2021 at 11:18
  • $\begingroup$ they also need a lot more power, pound for pound the same explosive will deliver far more energy in a gun than a rocket. $\endgroup$
    – John
    Jun 6, 2021 at 17:36

I'll proffer an opinion; the factors that would need to be overcome historically are:

  • Accuracy: unguided rocket artillery was and still is notoriously inaccurate. Against the close-packed troop formations of the era, the answer was to use them in large quantities to saturate the target area. However, for hitting individual targets at range, e.g. hitting a ship at a distance or hitting a fortification repeatedly in the same place to break it down, or even just hitting a specific part of a troop formation, that's not a workable strategy.
  • Anti-fortification capabilities: early unguided rockets could deliver explosive warheads to do blast / shrapnel injury to troops, they could deliver incendiary to cause fires in settlements, but what they could not do is breach a fortification. A cannonball does damage to a fortification through sheer kinetic energy, cracking stone and timber. The rockets of the era can't build up the momentum (black powder as a propellant is only modestly powerful; one of the early rocket artillery experimenters successfully made 55-132 lb. rockets with casings made of wood (!)) to do much kinetic damage and uncontained detonation of a black powder warhead against a fortification wall would do little damage because of the low shattering power (brisance) of black powder.
  • Cost : A cannonball is just a sphere of iron. The earliest practical artillery rockets, like the Congreve rocket, requires metal plate to be forged evenly, that metal to be painstakingly fabricated into a rocket, carefully packed with propellant, and a warhead with a fuze mechanism. All of this is very expensive given the level of metalworking and metal production available before the modern era. Additional complexity to make a rocket more accurate (e.g. the early spin-stabilized Hale rockets) or allow it to carry a bigger warhead would make it even more expensive.
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    $\begingroup$ Note that old-school rockets (aka ancient china old-school) were made using a ... paper tube rather than a metal one. Some other cultures (Laos) seem to have used bamboo for rocket bodies as well $\endgroup$
    – sdfgeoff
    Jun 6, 2021 at 4:41
  • $\begingroup$ " A rocket requires ".... Take used toilet roll. stuff the tube with gunpowder. Jam a rock into the one end. set the other end on fire. That is a rocket. ... A rocket does not need to be complex. A cannon does. even if you go mythbuster and make one from a log with a hole in it. Your example compares a 1600's cannon firing solid shot with a fuzed explosive warhead on a fabricated-metal rocket. Not a fair comparison! $\endgroup$
    – PcMan
    Jun 6, 2021 at 12:20
  • $\begingroup$ @PcMan I would suggest you re-read the question, which is about how rockets as a weapon could have dominated *historically*. The whole point is that they couldn't even at the advent of the early metal bodied rockets like the Congreve rocket. $\endgroup$ Jun 6, 2021 at 15:50
  • $\begingroup$ @sdfgeoff Good point, I should have been more clear that I was thinking of explosive warhead equipped military rockets, specifically von Geissler's wooden rocket experiments containing 16-lb warheads described here: books.google.com/… $\endgroup$ Jun 6, 2021 at 15:56
  • $\begingroup$ Add power, the same explosive is going to deliver far more energy firing a gun than split up an a rocket an payload. Historically they did not have high power explosives to work with so this was very important. $\endgroup$
    – John
    Jun 6, 2021 at 17:38

lack of ability to move large objects/make large metal objects could cause cannon artillery to not be very popular, as a large block of heavy cast iron is very hard to move & make. With rockets the platform of launch can be a simple as a large frame as there is no need to contain a large instantaneous explosion or deal with recoil forces. It would even be possible to have a large formation of infantry with 1-3 rockets & a very simple frame to fire these rockets one at a time to not have to move any singular large object at all.

  • $\begingroup$ Cast iron was only used in cannon because the material is immensely less expensive than a bronze cannon. The cast iron is much harder to work with, the resultant cannon is heavier, and it is much more fragile. But, it also cost less than 1/20th the metal price as the brass cannon it replaced. $\endgroup$
    – PcMan
    Jun 6, 2021 at 12:26

I'm assuming you mean "ball shaped cannon ball cannon" for this question.

First some background: We get conditioned with stories and media that fights were brutal affairs with every slash of a sword against the body killing someone and every cannon shot ripping through half a dozen bodies. In truth relatively few people died on the battlefield and most that did die would die from infection and disease after the battle.

When we hear of bayonet charges we picture people firing their last shots and then going on a stabbing spree. In reality bayonet charges almost always ended up with either party breaking up and falling back.

During the tail end of one of the world wars the British experimented with artillery barrages. Instead of the "standard" continuous barrage that could take minutes or hours, and occasionally days they would fire a short but heavy barrage. Then wait a set amount of minutes, then fire another short but heavy barrage. They found that after a continuous barrage most soldiers would still be around, but if they got plenty of clearly marked time to leave their defensive positions and get to safety they would.

The point here is that there are 3 rules that few people talk about in war:

  • people don't want to die.
  • (most) people don't want to kill
  • people who think they are about to die are the most dangerous on any battlefield.

The point here is that psychological warfare is far more important than pure killing power. If you only bruise an enemy formation but scare the living daylights out of them and get them to retreat you are already closer to victory.

Mythbusters had remade one of the rocket artillery of the olden days. It used rockets to deliver arrows and wasn't about it's explosive power. The rocket arrows were decently accurate, loud and with nice smoke and flashes. They also fired several dozen of them in one go for the best effect. As a weapon of psychological warfare it was pretty much perfect.

You can add other limitations. Such as a lack of proper metal but plenty of materials to build rockets, or a society that had evolved it's rocket technology and industrial capacity for rockets so far that switching to canons was simply not that useful anymore.


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