The Ship
A lesser-known fact about u-boat attacks is that most came during broad daylight and were conducted with the u-boat's deck gun not at night with a torpedo. The convoy system was yet to be established, so when the u-boats encountered individual unescorted ships rather than waste a torpedo, which they had on board in limited numbers, the u-boat would surface and shell the target with their deck gun. Sometimes the target would surrender, so the u-boat would send over a boarding party to help themselves to whatever they wanted before they told the ship's crew to abandon ship. They then scuttled her using no more valuable ammunition. However, when the target did not surrender or chose to run, the u-boat would just blow them out of the water with the deck gun.