4. I’m sure I’ve seen mentioned that one Northern unit used them for a short time (perhaps never in actual battle). But lances were more a curiousity than a weapon of war in the US civil war.
(I’m not going through a few thousand pages for documentation unless it’s important)
The landscape of Northern Virginia was inhospitable to lancer operations, although they did launch a moderately successful charge against a Confederate artillery battery while supporting General Burnside at Antietam, ultimately forcing the artillerymen to withdraw or risk losing their valuable cannon.