"Cremon" served as an auxiliary patrol boat during the early years of World War II in the "1 Vorpostenflotille", specifically serving off Norway immediately after the German invasion there. During the invasion, Norwegian minelayers frantically mined the harbors that German ships would soon occupy. One of these minelayers, , laid over twenty mines between Lerøy Island and Sotra and around Vatlestraumen. Since no minesweepers were available in the area, the two support vessels and "Cremon" were outfitted in mine clearing gear and sent to clear the area of mines. "Schiff 9" struck a mine and sank in less than two minutes, and when "Cremon" moved to rescue survivors she too struck a mine and exploded. Around six of her crew were killed.