I remember doing something similar on custom battle. One mongol heavy horse archer full up verse 20 units of eagle warriors no up. Just ran circles around the eagle warriors charging in whenever a unit is seperated. Didn't get bogged down but charged through everything. Had only 3 losses when enemy got down to 50% casualties, but then had a bad charge and was down to 20 men. After 10min of more cafeful charging, enemy down to about 150 men, but then made a fatal error and was down to 5 men, but enemy captain was killed. That 5 men single handedly killed all 150 left since they would run so fast that the eagle warriors didn't even get a chance to swing at anything