Uhm, a war with an ATB system, that'd be slightly weird. The only way I can really see a war game being done is in real time, or strategy. That form of a war game just wouldn't really work with the whole concept of war. But if you think you can design one that works, more power to you.
And who ever said you play the role of a commander, stop that, stop taking RPG for it's literal meaning. We all know that's not actually what it means.

THE JACKEL