Reaching back years again, I remember playing Red Warlord's (I think!) total conversion which formed nearly every nation of Europe. I suppose it was based much on the 30 Years War, or that general time period, where muskets and cannons were making pikes merely deterrents and heavy cuirassiers were the tactical arm of the armed forces.
Anyway, it was an interesting mod and I was hoping someone might still have it stored away... anyone?