KnowraU-boatLinked fromLinked fromThe 4 pages that link to U-boat, each with the reason it gives.All 4Broader topic 2Related 1Narrower topic 1Battle of the AtlanticBroader topic: U-boats were Germany’s principal weapons for sinking Allied shipping.Karl DönitzBroader topic: Dönitz built his wartime command around submarine operations against Allied shipping.