i'd say that if your talking knights, there would prolly be less then a hundred men, long swords for slashing and great big horse. They would in all likelyhoood be mostly from brittany and the pasture land of britian that hadn't already been taken by the saxons.

In all likelyhood military command would have been taken up by a bunch of leaders who held war bands of armored/unarmored spearmean and swordsmen and then the heavy cavalry which would be far far less numerous because their ability to affect a battle would be severly limited by the spears.

also most likely a few irishmen so kerns and more unorganized swords like big 2 hand swords