It's not shooting a muzzle-loading gun that's difficult, since they were inaccurate enough that most of the time the only real way to hit anything was to line up a bunch of troops, have them all point in roughly the same direction, and fire as a group.
The real difficulty was training the soldiers on how to reload in a timely manner. And also how to properly keep the gun in working condition.
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It's not shooting a muzzle-loading gun that's difficult, since they were inaccurate enough that most of the time the only real way to hit anything was to line up a bunch of troops, have them all point in roughly the same direction, and fire as a group.
The real difficulty was training the soldiers on how to reload in a timely manner. And also how to properly keep the gun in working condition.