- Disrupt Allied shipping lanes and supply lines: By sinking Allied merchant ships, the Germans could cut off the flow of vital supplies to Britain and its allies, thus weakening their war effort.
- Raid and sink Allied warships: By attacking Allied naval vessels, including warships and merchant ships, the Germans could further reduce the Allies' ability to transport supplies and defend themselves.
- Gain strategic control of the Atlantic Ocean: By gaining control of the Atlantic, the Germans could disrupt trade routes between the Americas and Europe, as well as threaten Allied naval bases and shipping routes.
- Break the Allied blockade: Germany was under a naval blockade imposed by the Allies, which restricted its access to essential resources and supplies. By defeating the Allies in the Atlantic, Germany could relieve this blockade and secure access to raw materials and goods.
- Boost morale and gain a psychological advantage: Achieving victories at sea and disrupting Allied shipping would be a significant morale boost for the German people and their military. It could also demoralize the Allies and sow uncertainty and doubt about their ability to continue the war effort.