A Womens Royal Naval Service (Wren) plotter in 'The Citadel', the Western Approaches Command (WAC) Headquarters bunker underneath Derby House in Liverpool, 1944. WAC was responsible for protecting all Atlantic shipping. On this huge wall chart, Wren plotters recorded the movements of convoys, warships and U-boats, while senior officers from the Royal Navy and Royal Air Force planned the battle like a giant game of chess.
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