I was doing really well, with things in the east maybe going my way, when I was assaulted by some crazy over 100k union force. They went and just plowed through Manassas, and if it wasn't for P.G.T. and his magic, I would've surely lost the game.
I remember reading about how these monster stacks wouldn't be in the game, due to the way the command chain worked. And while I can see how you could just march around it in the west, it absolutely kills in the east, where it can just take whatever it wants.
I'm just kinda lucky that one, it went back to D.C. after I threatened to take it, and two it looks like it split up when Lee started going to New York, while Johnston once again threatened to take the capitol.