Aemilius Paulus,
Remember that against the combination of stirrup, saddle, destrier lance and armored dude trained since childbirth little can stand. In this aspect Medieval is realistic since you better leave at least some sort of spearman to brace against the charge and then you will need at least pikes to fight Gendarmes and other cavalrymen. These guys were literally giant tin cans with pointy poles and some were even able to break through solid pike formations.
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