Cavalry, as in a pony on the back of another pony. Both are clad in heavy plate armor. The pony on the back of the other pony is smaller, and his hooves don't touch the ground. The pony on the back is wielding a lance or some other melee weapon. Or sometimes a bow, so it can act as a mobile horse archer unit. As a horse archer, it may wear lighter armor or no armor so it can move fast.

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Is the basic earth pony military unit infantry, or cavalry?

Please overthink as much as possible, then justify your answers.