Destroyers were the workhorses of anti-submarine work. During the First World War, the British developed destroyers into specialised hunter-killers of German U-boats. This cut-away diagram shows the result., It depicts a British destroyer of the early interwar period, showing the full range of tried-and-tested anti-submarine devices. The ship is armed with a searchlight, a 3in anti-aircraft gun, five 4.7in quick-firing guns, torpedo tubes, and depth-charges.

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