User blog comment:123chaseyoung/Knights Hospitaller vs Sohei Monks/@comment-422690-20171101042159/@comment-422690-20171101155107

Reloading would have been the infantry's job, and there's more infantrymen than cavalry here. Further, the yumi was primarily an infantry bow during the Sōhei's time. Yabusame was a sport or training exercise more than a battlefield technique; a Yumi was too large to maneuver effectively in a majority of the types of combat one would see during that time period.

The crossbow was, in general, less useful on horseback than a bow. However, this specific matchup breaks most of the general rules for ranged weaponry.