Born Invincible (1978)

Two warlord chiefs, a ton-fa wielder who can destroy an opponents weapon and a Tai Chi expert that is impervious to weapons, send a pair of killers to track down and kill an old master swordsman who has given up fighting. When the killers assassination attempt is foiled by a group of kung fu students from a nearby school, the chiefs themselves come to the school to deal with the master swordsman and anyone else who gets in their way. When the schools head master dies defending the swordsman and his daughter, the schools 3 most senior students vow to avenge the deaths and begins a quest to annihilate the warlord chiefs. One by one, they end up facing a man so skilled in tai chi kung fu that it seems as if he were 'Born Invincible'.