Guys, just a word in:
maybe I'm wrong, but... the Mongols actually did not have and thus did not use any infantry untill very late in the XX century... - They were and still are people of the horse and all they did was using lightning-fast cavalry attacks, especially with arrows and bows (the preferred distance fighting until their enemy were really weakened and then ended up the matter with one quick assalt).
Well, in fact, the did have infantry - as a small-numbered emperor-guard forces, but their horrible army was all horsemen.
Anyway, footmen were really tremedowsly useless in the surroundings the Mongols lived and in the warfare style they used. Even in Yuan dinasty of China (the one that was founded by the Mongolian Khubilai-Khan after the Horde took China and overthrown Song dynasty) the infantry was all the Chinese and the ethnic Mongols formed elite horsemen forces for quick actions and swift rides throgh the stepps.
The most fantastic example of devotion of those people to their horse-wars were the futile attemps of invasion to the Japanese islands from the mainland China:
they constructed thousands of huge rafts- you know to do what? - No. not to use them as a vessels for transportation of regular medieval warriors from their Chinese stronghold to Japan. - They tried to use the rafts as a pontoon-bridge to allow immense hords of the Mongolian cavalry to invade Japan through the gulf.
But - the chldren of the stepps did not take into account a Mosson climate of the Pacific Asia - a rather strong (but really just typical) typhoon-wind ("Kaze" in Japanese) destroyed the impromptu bridge and the invasion into Japan failed. The Japanese saw Will of the Gods ("Kami") in this events.

(the legend of the "Sacred Wind" was revied during WWII)
So... I would not mbe so sure about the "Mongolian infantry" - this is a very BIG fiction.