I was reading about military units of the 3K period in an Osprey military history book. It stated that a typical army formation would see the crossbowmen on the frontline, with spearmen behind, and then behind the spearmen would be units of swordsmen ready to engage an enemy breakthrough. Did China of this period have large numbers of dedicated swordsmen? As with most ancient and medieval infantry, the main weapons were the spear and bow.