In 1941, as the Battle of the Atlantic raged and ship losses mounted, the British Admiralty desperately tried to find ways to defeat the U-Boat threat to Britain's maritime lifeline. Facing a shortage of traditional aircraft carriers and shore-based aircraft, the Royal Navy, as a stopgap measure, converted merchant ships into small 'escort carriers'. These were later joined by a growing number of American-built escort carriers, sent as part of the Lend-Lease agreement.

The typical Escort Carrier was small, slow and vulnerable, but it could carry about 18 aircraft, which gave the convoys a real chance to detect and sink dangerous U-Boats. Collectively, their contribution to an Allied victory was immense, particularly in the long and gruelling campaigns fought in the Atlantic and Arctic. Illustrated throughout with detailed full-colour artwork and contemporary photographs, this fascinating study explores in detail how these adaptable ships had such an enormous impact on the outcome of World War II's European Theatre.

Angus Konstam hails from the Orkney Islands, and is the author of over 100 history books, 60 of which are published by Osprey. This acclaimed author has written widely on naval history, from Sovereigns of the Seas and Piracy: The Complete History to his most recent bestseller, Jutland 1916: Twelve Hours to Win the War. A former naval officer and museum professional, he worked as the Curator in the Royal Armouries, Tower of London and the Mel Fisher Maritime Museum in Key West, Florida. He now works as a full-time author and historian, and lives in Edinburgh, Scotland.