I'm trying to stop a German crusade into one of my provinces, (Palestine, wasn't my province when the crusade started, Germans are one of my allies) but when the crusade gets to Constantinople, I decide to not let it pass. Now, the crusade has about 300 more men than I have in constantinople, but everytime, no matter how many men I add to the province (by playing a save a few years earlier) my men seem to chain-route. And I mean every time. I have played back a battle in which my front line of H2H soldiers hit the front line ALMOST exactly at the same time. None were peasants. Two Militia units, but the rest were Byzantine Infantry, and Vangarian Guard. Before that, my Trebizond archers took out a good bit of at least 4 units. The crusade had some Teutonic Seargeants, some Order Foot Soldiers, and some Royal Knights (the generals unit, had 13 Knights). Other than that, only spearmen and and archerers.

Why is my army chain-routing? Are Teutonic Seargeants really that good?