Magnificent, full of possibilities
You, my good man, are a strategy-game god in the making. Your gameplay is impeccably engrossing, letting the player develop his/her own strategy and tactics. My favorite is the "Pythagorean" pincer, where I fight two simultaneous fronts... gets the computer every time. The AI is a good challenge, though it's easy to outmaneuver or outwit, perfect for both starters and masters alike.
I find your attention to details beautiful and fun. I noticed that whenenver a battle took place, the area around it seemed to die/become war-torn, with gravestones and green-to-brown ground. Believe me, my friend/anyone playing the game, that makes all the difference in war: EVERYONE becomes affected.
One thing I think the game would need is a compelling story, or anything that takes the customization of the gameplay and perhaps make it aesthetic: naming your capital, your faction, yourself, giving your nation/people a story, etc. Also, campaign modes would be perfect, especially if you model it on real-life locations. And also, engrossing the player more into the battles would be great (if you know Advanced Wars, something along those lines).