| english title | The Invincible Fist |
| aka | Ruthless Iron Hand |
| year | 1969 |
| country | Hong-Kong |
| director | CHANG Cheh - 張徹 | |
| actor | LAU Gong | |
| CHEN Sing | ||
| KU Feng - 谷峰 | ||
| David CHIANG - 姜大衛 | ||
| LO Lieh - 羅烈 | ||
| LI Ching | ||
| producer | Run Run SHAW | |
| scriptwriter | NI Kuang | |
| artistic director | Johnson TSAO |
| shooting studio | Shaw Brothers 邵氏 |
| production studio | Shaw Brothers 邵氏 |
This is one of the few films where "Godfather of the kung-fu film" Chang Cheh headlined Lo Lieh as the leading hero, three years before Lo would become Shaw Brothers' first international star in King Boxer. Here he plays a dedicated chief constable for Tsang Chou village, who falls in love with the blind daughter of a bandit who is wreaking havoc. Joining him in all the action and emotion are award-winning actor Ku Feng and future superstar David Chiang.
