Mongols of Khan's time are generally considered to be a cavalry army, which makes sense logistically, given the width and speed of their military maneuvers.
But is there historical evidence of Khan's Mongol armies ever using infantry in any significant degree (e.g. >5% of a given fighting force)?
I'm mostly interested in timlines around Gengis (1206-1227) but pretty much anything till the time of Kublai Khan (1294) is fair game.
Please note that I'm using a narrow definition of infantry: soldiers trained and equipped to fight primarily on foot (they may have horses for movement but always/primarily fight dismounted, using infantry tactics).
I'm only including front line soldiers - e.g. auxiliary engineering, logistics, and whatever equivalent of military police/garrison troops inside the empire the Mongols had do not count, even if they were not cavalry.
Non-horsed-archers are probably in-scope, but again, only if they were explicitly meant to fight on foot as opposed to simply regular cavalry archers that were dismounted for accuracy at a specific part of the battle. Depends on details.
Inspired by this Q&A.