Okay actually this is what I meant:
1. The Drums are played too perfectly. On the battlefield even a well trained musician would have a hard time keeping up with the pace with cannon shells exploding around him and musketballs whizzing over his head. Even if the drummer is getting all the beats right, like he should be, I think it should sound more urgent and rushed to match the feel of battle.
2. The drums sound too loud and contained. You're right, it isn't a huge deal, but there's always been something uncanny sounding about the drums when I hear them, and I placed my finger on the studio recording.
Have you considered attempting to record outdoors? I know it's more professional to record in a studio and there's much less that can go wrong, but you did say you're going for the realism approach, so I think it could be something for you guys to think about.