any rider worth his salt...
and especially a war-trained rider can control his horse with his legs. Certainly I never had trouble controlling MY horse with my legs in battle. I would consider a horse that was not thus trained useless for combat.
Imagine a man using sword and shield; how do you think that he controlled his horse; with a third hand?
A samurai drawing a bow would be in the same position. Thus, the use of a sword with both hands would be quite possible!
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