I really think there is something I fundamentally don't understand about cav.
I lose hundreds and hundreds of men that get captured again and again. I've tried standing my ground, charging right back at them and anything in between and I end up seeing that damned white flag all the time. I tried charging another regiment into the fray but they generally just stand there and don't get involved. I don't even know what I did different that time. I'm just bleeding men it seems. Doesn't seem to matter much if I use veterans or not. They just get captured and I'm out yet more men.
The key seems to be to take them on before they get close but that's hard when all my men just fold.

Just as an example: everything was going decently. The rebs launch the second attack and I generally hold it an move Custer in to support. After losing 67 men he gets captured. How do I avoid that?