A small village is taken over by the nasty Japanese, who kill the town's top kung fu fighter in order to scare the populace into submission. Escaping the wrath of the Japanese, the son of the master flees into the hills, where he trains with a group of rebels led by Gam Kei-Chu. Fast-forward ten years, and Chuen returns to the village armed with his father's secret technique of the Thunderbolt Fist with the hopes of killing the leader of the Japanese.
Após a morte do patriarca em batalha e sem poder contar com o suporte do exército imperial, viúvas chinesas se unem para defender a sua terra de novos ataques, enquanto planejam uma vingança contra seus inimigos.
Um grande clássico das artes marciais da produtora Shaw Brothers. Chao Chi-Hao (Lieh Lo) é um jovem estudante de artes marciais, que parte da sua vila e da sua antiga escola para melhorar as suas técnicas com um mestre mais poderoso. Após muito treino, é selecionado para representar a escola de Shen Chin-Pei (Min Fong) num grande torneio de artes marcias local. Ao declarar a sua escolha, o mestre de outra grande escola local, Meng Dung-Shun (Feng Tien), e o seu filho (Lam Tung) começam a tramar um modo de acabar com as chances de vitória por Chi-Hao e a sua escola. Para vencer o torneio, Chi-Hao deve aprender a incomparável técnica dos Punhos de Aço, superando todos os desafios que são postos no seu caminho.
Instructor Lin who is home from training the imperial troops for several years. He meets his wife and runs into his brother who has become a monk at the local temple. His superior Lord Gao, strangely decides to rape Lin's wife in the temple but Lin interrupts the crime. His brother is enraged and tries to kill Gao but Lin stops him with the help of Lin's training brother and old friend Lu who works for Gao. Lin is loyal to the Commissioner and will not do anything to harm his son. Once back at the Commissioner's house, Gao and Lu hatch a plan to discredit and eventually kill Lin all with the Commissioner's approval. The plan is put into motion and Lin is unjustly arrested for trespassing on imperial property.
