The invention of stirrup played a very important role in improving the combat effectiveness of cavalry.

It freed the cavalry's hands and made it possible to ride the bow at once. Without stirrups, cavalry can only hold the horse and use long-range weapons, otherwise their feet have no center of gravity and they can't loosen the hand that controls the reins.

Stirrups are also of great significance to lancers. Without stirrups, one-handed light weapons or long-pole weapons can't do their best, or they will be pushed down by reaction. With stirrups, you can do your best in chopping and bending.