You misunderstand me. a crossbow is a part of the bow family, i don't mean that they are the same. just like a reflex bow or a compound bow is a part of the bow family. like a Chinese is a Human being, but a Human may not necessarily be Chinese. A cross bow is a type of bow and it is sematics, is a dao a knife/sabre and a jain a sword? its where you choose to define what it is and we are very comfortable calling a sabre a sword in this discussion, so why not a crossbow as a bow? Read my statement: Zhou is a long dynasty, at the end of zhou, they do make iron swords: Ofcourse iron rusts away and bronze is more inert so we have more historical artifacts that are bronze. The point is, Chinese infantry were not just armed with a single weapon and that swords are a secondary weapon to the other equipment they are wielding be it pole arms, bows, etc. This is consistent with all ancient cultures. this is back to the discussion of how long a sword needs to last and it needs to last the battle or campaign.