Ironically, the Romans were the only ones using crossbows in that movie.Yes I I was referring to 'Dragon Blade'. I was using Chrome at the time and sometimes it does not let me use the 'Quote' function.
Yes, it would have been a interesting matchup. While I dont know how they would have coped with Roman tactics, I do think the crossbow so well utilized by Qin Shi Huang would have still given the Han a advantage.
I recall invading China was on Tamerlane's bucket list. I wonder how he would have got on had he lived to do so.
And one on one, how well would Kublai Khans soldiers cope with the stylized Samurai style of fighting if his invasion force was able to land.
As for Mongols vs Japanese, from what I recall, the Japanese were getting their asses kicked by the Mongol vanguard until the typhoon that sank the rest of the Mongol army resulted in the vanguard becoming cut off and surrounded. IIRC, Japanese swords were of such poor quality that they frequently broke against Mongol steel.