Sersly There the first things i use cause there superb at eliminating week units in rebel camps. That and 2 650 upkeep for the KAT's and 2 300 upkeep Axemen is way to high at the beginning of the game to keep economy building. At lest for Rome. I typically end up with a unit of 5 out of 25 left so i can rebuild a gold unit as soon as i can make them.
I spam Leet stacks and rain terror. I used to make nothing but mamluk horse army's that could pawn several enemy stack before needing a refresh and carve a path of destruction to there city's for other unmounted units back in vanilla.
Speeking of witch...
Its harder in BC and the Mongols rained Terror on my leet army's when i tryed to fight them with the Khwarezm Shah. They even killed a leet filled citadel WITH CANNONS! using like 5 army's. That kinda crippled me and then they settled there so i called it lost. Correct in full preparation i still lost to the Mongols.