Invading China during the Golden Age

I'm Genghis Khan (not Temujin) and I want to invade China before my character dies, they're in their golden age how many troops can I expect to see?

I'm nomadic and I have insane commanders so I'm not to worried because horse archers are broken, but if I see like half a million troops spawn then I don't think I can do much with my barely 50k troops (including allies and mercenaries etc...)