While on the return voyage to Gotenhafen on 15 October, "Prinz Eugen" inadvertently rammed the light cruiser amidships north of Hela. The cause of the collision was heavy fog. The light cruiser was nearly cut in half, and the two ships remained wedged together for fourteen hours. "Prinz Eugen" was taken to Gotenhafen, where repairs were effected within a month. Sea trials commenced on 14 November. On 20–21 November, the ship supported German troops on the Sworbe Peninsula by firing around 500 rounds of main battery ammunition. Four torpedo boats—"T13", "T16", "T19", and "T21"—joined the operation. "Prinz Eugen" then returned to Gotenhafen to resupply and have her worn-out gun barrels re-bored.