''An amateur British military historian has unearthed a vast underground Nazi gun battery complex thought to have caused carnage during the D-Day landings.

Gary Sterne, 43, discovered the huge "Maisy Battery" after he found a crinkled map which fell out of an old pair of US serviceman's trousers at a military memorabilia fair in Stockport.

It turned out to be an invasion map for Omaha Beach, which included an area marked "area of high resistance". Mr Sterne, a publisher and collector, believed that this could show the "lost" Nazi gun emplacements, which became buried by nature after the war and could not be located.