Akbarthegreat
Angel of Junil
well, if you're planning on razing all the AI's cities you shouldn't attack with just one stack. two/three vanguardstacks from multiple directions with a stack as rearguard.
vanguard stacks take out the cities (and destroy settles the come across) rearguard takes out anything that managed to slip between the vanguard.
But war with many civs at the same time is risky. In my OCC conquest try, Byzantium won domination! I had to reload and declare war sooner to win.