Hrm, I don't know whether this is a "bug" per se, but I noticed something with the map. In vanilla, the compass points north (towards the Nords), but in the Chaos War, it always points south, as if the map is the wrong way round (the Northern Kingdom is actually in the south). Of course, this doesn't make a difference one way or the other, as you can just turn your map around so that the Northen Kingdom is at the top of your map, but I just thought I'd say.
Another thing, when you "call for reinforcements", the enemy seem to get a load as well, which kind of nullifies the advantage...fair enough them calling for more when they see they're outnumbered, and even calling for them before you know, to get the advantage (that'd be awesome, to suddenly see a load of crusaders thundering towards you and frantically calling for your own reinforcements), but having them appear at the same time kinda ruins the feature, as all you're doing is making the fray bigger without any tactics.
If you tell a party member that you want to give them some troops, they tend to run off before you can give them. It would be nice if they could hold position so you can give orders and troops without having to chase them. Again, I don't know if this is a bug.
Another thing i noticed is that even if you're playing as another member of your party, if you die, you still get the "game over" screen.
I'll keep playing, and say anything else i notice