Chariots? No way, not in my EB world lol. If i use chariots, they get churned up as soon as they hit the enemy lines. They barely go into the ranks at all...Elephants will obviously have the greatest mass (unless the world is completely weird) and heavy cavalry will follow soon after. The mass should be determined by the combined weight of the entire unit; that is, the person, any animal they ride, and the amount of armour and the weapon they carry.
Dunno about Kill rate, we need a long time veteren to answer that lol...hint hint
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