D0NIMATRIX
Full of drivel
First, there is the obvious settler rush to get as much free turf as you can before war is necessary, then powerful units (i/e swordsmen, med. infantry, longbowmen, knights) become available, and you start fighting neighbors. This continues all through the middle ages, and finally, riflemen begin to kill cavalry. Most of the industrial age is just waiting for tanks and bombers. After that, it's just war or no war, because artillery(bombers) become useful and powerful as well as land fighters.