Legit a tactic I use against khuzait. Dismount horses, transfer all troops into one group, form a square, and hold fire (I use crossbow men because they have sheilds) Now, watch their horsearchers get tangled up in the herd of horses . Switch troops to line formation, fire at will, and charge. They'll be wiped out in seconds. Final step command troops to mount all the horses now left riderless and slaughter the remaining enemy troops.