I'm not sure if I've posted this here before, but as I grew up doing civil war re-enacting with artillery, a few things about muzzleloading artillery that most movies get horribly wrong:
- Several guns firing at exactly the same millisecond. Clearly, they're electrically fired from behind the scene, but you'd never see that in real life, especially in an era before friction or percussion primers and gunpower was poured directly over the vent
- Putting the charge about 18 inches down the barrel. That charge has to go to the very back of the barrel, as that's where the vent is to set that charge off
- Guns recoiling long after they've gone off. Field guns do recoil with live charges, and the larger ones can go back some distance, but they do so the moment they go off, not a second or two later!
- Measuring the time between the shot and impact with a calendar. Most movies screw this up so the audience can realize where the shot is going, but even old muzzleloading weapons fired stuff pretty darned fast
- Artillery within the range of a good baseball throw. Most movies show artillery shooting at insanely close ranges, well within rifle range. Even in the 18th and 19th century, you could have been schwacked by a gun you barely saw, if at all. Most of that was line-of-sight but you could be accurately nailed by a gun a long way off
- Counter-battery fire. Artillery 'duels' (known today as counter battery fire) are very rarely depicted accurately. In fact, I can't think of a single movie that shows that happening. At the Gettysburg cemetery, there's a gun with an impact mark on the muzzle where an opposing gun almost lobbed it's round down the bore
Now, "Gettysburg" did a
great job with artillery as they used re-enactors with real (and several original) pieces and "Glory" did decent, but they showed guns set up in very odd locations, but these are not common depictions. I'm not familiar with any movie ever made that focuses on a gun crew in any era prior to the 20th century...