By June 1942, aircraft equipped with ASV radar and the Leigh Light were operating over the Bay of Biscay intercepting U-boats moving to and from their home ports on the coast of France.
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The Leigh Light (abbreviated L/L) was a British World War II era anti-submarine device used in the Second Battle of the Atlantic.
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On 8 October, the outbound boat was attacked by a Leigh light-equipped British Wellington bomber of No. 612 Squadron RAF in the Bay of Biscay.
Her third patrol, beginning on 27 October 1943, was marred by the attack of a Vickers Wellington equipped with a Leigh Light off Cape Ortegal in the Bay of Biscay on 30 October.