Liverpool will mark the 80th anniversary of the Battle of the Atlantic with a series of events.
The city played a crucial role in the battle, which was the longest continuous military campaign during WWII and saw the Allied and Axis powers fight for control of the ocean. The Allies worked to secure Britain's merchant shipping, bringing goods in and out of the country.
From 1941, Liverpool's Derby House, which now houses the Western Approaches WWII museum, was the headquarters of the Combined Operations. It looked after British shipping in the Atlantic Ocean directly to the west of Britain and Ireland.
