Genghis was an avid user of both established and novel siege techniques, and made great use of captured Chinese engineers. Though gunpowder was not core in his siege techniques, his successors utilized it to a far greater extent.
The Great Wall was never meant to decisively stop large nomad forces, only to stall them long enough for an army to be mustered instead of facing a bunch of nomads at your capital around the same time you hear about them crossing the border. Gates can be battered down, sections of wall can be scaled or undermined, etc.
Genghis was an avid user of both established and novel siege techniques, and made great use of captured Chinese engineers. Though gunpowder was not core in his siege techniques, his successors utilized it to a far greater extent.
The Great Wall was never meant to decisively stop large nomad forces, only to stall them long enough for an army to be mustered instead of facing a bunch of nomads at your capital around the same time you hear about them crossing the border. Gates can be battered down, sections of wall can be scaled or undermined, etc.
(smaller nomad raids it was expected to stop)