"Guitarro", "Bream", and "Raton" rendezvoused 30 October and the three boats attacked a convoy off Cape Bolinao that night. Unable to score any hits until the next day, "Guitarro" managed to work her way inside the screen and fire no less than nine torpedoes at 08:47. She observed one cargo ship break in half and was rocked by a tremendous explosion from another direct hit on an ammunition ship. "Guitarro" was driven down by the force of the explosion, prompting Comdr. Haskins to report: "The Commanding Officer never wishes to hit an ammunition ship any closer than that one." She teamed up with "Bream" and 4 November to sink passenger-cargo ship "Kagu Maru". After "Bream"'s initial attack, "Guitarro" added four hits before diving to avoid escort vessels.