This is just a place to jot down findings as I fight battles.

First finding: Wow. Running around in circles works.

"Cantabrian circle" for missile cav in Medieval Total War wasn't that useful. It reduced accuracy and tired the horses out.

The same trick ("Swooping Crane," I think it's called) works in Shogun 2. In custom battles, a 60-man bow-cavalry unit lost 12 men while routing and a 120-man run-of-the-mill foot archer unit and killed a total of 68 of them.