Thông tin phim

Sergeant Dragon Ma is part of the Hong Kong Marine Police's effort to suppress the pirates, who have been raiding ships for months. Members of the Hong Kong Police Force and the Marine Police, who have strong inter-service rivalries, get into a fight in a bar. Shortly after this, Captain Chi releases all of the sailors to their commanding officer, and two of the Marine Police's ships get blown up.

Gangsters Chiang and Mr. Chou meet at a VIP Club and discuss fleeing to Vietnam. As soon as Chiang leaves, he meets one of the pirates and they laugh about sabotaging the Marine Police ships. The pirate tells Chiang that his boss, San-po, wants 100 police rifles.

Dragon Ma and his squad are forced to become regular police officers. They have to undergo "hard training" with the police under Captain Chi's nephew, Hong Tin-tsu. After the police learn that Chiang is at the VIP Club, and that the guests there are not to be disturbed, Dragon and Tin-tsu go to arrest Chiang. A big fight breaks out. Tiring of the blatant corruption in the police force, Dragon arrests Chiang out and tells Tin-tsu to take the credit. That is his last official act as an officer with the Hong Kong police.

Fei finds Dragon in the street. They have a conversation and Fei reveals that someone in the police force is selling rifles. Fei tells Dragon that all he wants are the guns, and Dragon can catch the traitor. At night, Dragon and Fei interrupt a gun deal between the Army and the police Captain. After pushing everyone into the water and making off with the guns, Fei hides the rifles inside a log and marks it with a red flag. He later tries to sell the guns to the gangsters and pirates, but Dragon has removed Fei's red flag and put flags on other logs instead.

Having thwarted Fei's plan to sell the rifles to the pirates, Dragon has a conversation with the Admiral's daughter, Winnie. He learns that the Captain wasn't smuggling rifles for San-po, he was buying the rifles from the army to arm his men. Overhearing this, Fei gets into an argument with Dragon. The gangsters come after Fei, and he tells them that Dragon is to blame for the missing rifles. Dragon is forced to flee with Winnie. After teaming up with Fei, being tortured for information about the rifles, and falling from the face of a clock tower, Dragon is tracked down by the police for a for a third time, and they help him get away as they arrest the gangsters.

Having lost the rifles, the pirates take a ship hostage, the passengers including a Rear Admiral. Mr. Chou proposes an arms-for-hostages deal and the Colonel consents. Having overheard the conversation, Dragon confronts the Colonel and convinces him that the gangsters and the pirates will never fear the law if the police force are corrupt. It is agreed that Dragon will assume all responsibility for the mission to save the hostages, and the Colonel allows the Marine Police to be brought back into full force.

Mr. Chou is brought in by the police and beaten until he tells Dragon and Tin-tsu how to get to San-po. Dragon, posing as Mr. Chou, gets on board a ship that takes him to San-po's hideout, and they are followed by the rest of the squad. Fei sneaks aboard and poses as a pirate. After a lot of tricky undercover work, the cavalry arrives, and there is a final confrontation in the middle of the pirate's lair. Dragon, Tin-tsu, and Fei engage in a hand-to-hand battle with San-po, eventually killing him with a hand grenade when he's rolled into the carpet.

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