I was taking AP Modern European history and my favorite part of it was the 19th century, but now that it’s over I noticed that they never had gone over how when the idea of line battles ended. Also what were the weapons used. In American history (I know more about the weapons there) in around the late 1860’s Muzzle loading rifles were being upgraded or modified into a new “trapdoor” Springfield, which used a casing for the cartridge, but I know nothing about the weapons used in Europe and Asia. Also how did they fight? I’m assuming rifles accurate enough by then so firing in volleys wasn’t needed.
Well, it depends on what precisely constitutes a 'line'. The now-deleted u/elos_ has an answer covering this matter specifically, and also touches on the weapons used then.