What do you know about the military achievements of Genghis Khan?
The steppe cavalry had always travelled light and moved quickly, but not it brought all its knowledge of the terrain and the weather to do the unimaginable: they carried out campaigns in the depths of winter, treating frozen rivers as highways to enemy cities and camps. Nomads were conventionally at a loss against fortified encampments but Genghis Khan learnt the importance of siege engines and naphtha bombardment very quickly.
His engineers prepared light portable equipment. Which was used against opponents with devastating effect.