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National Geographic : 1941 Nov
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Canada's War Effort S1 i 1i 1Iv I, Day and Night, in Fair Weather or Foul, Sleek Greyhounds of the Sea Guard Their Charges Zigzagging on the flanks of the convoy and cutting in and out between the ships, the speedy destroyers are ever on the alert for a suspicious periscope or surface raider. Depth charges, or mines exploded by water pres sure, are the destroyer's chief weapon against submarines. Convoys must travel at the rate of the slowest vessel. The ships are usually divided into groups according to their cruising speeds. Most torpedoed victims now are "lame ducks," or ships which have dropped behind the convoy because of engine failure (page 582). p 1,^ -.~
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