"Narwhal" was loaded down with of ammunition and stores and a party of ten for her seventh patrol, from 23 October – 22 November, supporting Philippine guerrillas. She was in the Sulu Sea, off Mindanao, the night of 10 November "en route" to Puluan Bay when two Japanese ships astern opened fire. The night of 13 November, she entered Ptiluan Bay stealthily to disembark her passengers and half of her cargo while lying off the starboard side of "Dona Jitana Maru". By midnight "Narwhal" was safely on her way to Nasipit, on Mindanao, where she docked on 15 November to unload the rest of her stores to the tune of "Anchors Aweigh" played by a grateful Filipino band. She then embarked 32 evacuees, including eight women, two children, and a baby, for Darwin, Australia, and the end of her patrol.