Europa Universalis III

[The Wizard]

Early game, no artillery, about 15 regiments, 10 inf and 5 cav, but I have no real system. Late game I mix in tons of artillery (1 arty regiment for every inf) to maximize firepower. My armies get slow as a snail but they cause such high losses to the enemy that I win by WE and depleting the enemy's MP. Admittedly, I haven't played more than two games into the late game, though (1788 and 1700 is when I quit respectively).