二次世界大战期间,美国政府密令军方潜入一中立港口,摧毁德国军舰。既然是中立港口,英国军官路易斯庞和葛文瓦特决定,任何任务失败的人都需三缄其口,他们故意派出酒醉的老人假扮村民,这些老兵真能立大功顺利摧毁敌舰吗?In March 1943, in the World War II, the Germans use the neutral harbor of the Portuguese colony of Mormugoa to transmit information to a U-Boat about the allied ships to sink them in international waters. In Calcutta, the British Intelligence assigns Colonel Lewis Pugh and Captain Gavin Stewart to spy in Goa and they discover that there are three German vessels anchored in the area and the famous spy Trompeta is based in Goa. They kidnap Trompeta to interrogate him but Lewis accidentally kills the spy after fighting with him in the runaway car. Meanwhile Gavin has one night stand with the gorgeous and elegant Mrs. Cromwell, who is the partner of Trompeta. They fail in their mission, but Lewis and Gavin convince their chief to use the veterans from Calcutta Light Horse led by the retired Colonel W.H. Grice to travel to Goa on board of the old ship Phoebe, pretending to be drunken businessmen on holiday. They prepare to destroy the Ehrenfels and the two other Nazi radio ships and get the German secret codes under the command of Lewis. Meanwhile Gavin on shore has a love affair Mrs. Cromwell and prepares the diversion to facilitate the mission of Lewis and his men.