Killer Darts 1968 ( 6.5)

They brutally killed his wife, wiped out dozens of his innocent people, and burnt his entire village down to a charbroiled crisp. Now, master Liou Wen-lung is out for revenge. Armed with a near-invincible sword style and a pack of killer darts, he heads out to settle a 10-year old grudge with the cold-blooded evildoers. Joining him is his son, an orphan named Yu Sien and his trusty servant.