the spearmen on the ground can plant thier spears in the ground and brace while aiming in a defensive wallDeathling said:I never got why spearmen overpowered mounted units. I mean they can both wield spears...
the spearmen can also skip the shield keeping both hands free, as it is the (rather large) pike formation that provides the protection
plus calvalry can't use spears effectively because you need one hand to ride and the other hand to hold your sword
cavalary require a weapon you can actually swing from horseback
(lances are not made for breaking spear formations and aren't a practical weapon to begin with)