Leigh Light
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The Leigh Light (L/L) was a British World War II era anti-submarine device used in the Battle of the Atlantic. It was a powerful carbon arc searchlight of 24 inches (610 mm) diameter fitted to a number of the British Royal Air Force's Coastal Command patrol bombers to help them spot surfaced German U-boats at night.
A Leigh Light fitted under the wing of a Consolidated Liberator aircraft of the Royal Air Force Coastal Command, 26 February 1944
Photograph of a destroyed U-boat illuminated in Leigh Lights
The Observation Post at Putsborough overlooking Morte Bay
The Indicator arrow at Putsborough overlooking Morte Bay
Anti-submarine warfare
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Anti-submarine warfare is a branch of underwater warfare that uses surface warships, aircraft, submarines, or other platforms, to find, track, and deter, damage, or destroy enemy submarines. Such operations are typically carried out to protect friendly shipping and coastal facilities from submarine attacks and to overcome blockades.
Royal Navy officers on the bridge of a destroyer on convoy escort duties keep a sharp look out for enemy submarines during the Battle of the Atlantic, October 1941
An example of an anti-submarine net, once protecting Halifax Harbour, Canada.
11-inch Howitzer Mk. I on British armed merchant cruiser HMS Patia in 1918, it had a range of just about 600 yards (550 m)
A depth charge thrower being loaded, aboard corvette HMS Dianthus, 14 August 1942