One of the reasons spears or lances are probably seen more in Northern kung fu than in the Southern systems is that the spear was originally a cavalry weapon, a good weapon to use on horseback because of it’s long reach much longer than a sword also for the same reason for foot soldiers to use against someone sitting high on horse back.
The length of spears used in the North differ 6, 9, to 12 feet.
The long spears were used to protect archers from attacking horseman much the way a pike was used to protect musketeers in European armies, I think Xingi still use this kind of spear in their practice.
Also In the Song dynasty because of trouble China was having with the constant invasions by the Mongols and the other nomadic horsemen it was compulsory in some of the northern provinces for every man to practice the spear.
"Ira furor brevis est !"
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I didn't want fries with that or even soda doesn't any one in this dam country ever listen.