Military ships have arrived in Liverpool for the Battle of the Atlantic 80th anniversary commemorations.
This weekend will see the city mark the anniversary of one of WWII's most important battles. Throughout the war, the Allies worked to secure Britain's merchant shipping, bringing vital goods in and out of the country.
Liverpool played a key role in Allied success in the battle. From 1941, Derby House on Rumford Street was the headquarters of the Western Approaches Command Centre, which controlled the defences of British shipping. It is now the Western Approaches WWII Museum.
