Naval Campaigns Wolfpack

Historically, Great Britain being an island nation has been one of it's great strengths. However, with the development of the submarine, that strength also exposed a vulnerability. Britain was absolutely dependent on its maritime lifeline, a lifeline the Germans had nearly severed in the Great War, and one they would attack with even more fury in the Second World War. Wolfpack covers the battles over that lifeline, not only from the perspective of the U-Boats, but also that of the escort commanders on their cold and lonely vigils in the North Atlantic. Can you bring down the transports that carried the very life blood of Britain? Can you keep the hunters of the sea away, and keep your charges safe?