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#Convoy HX 237 #battle of the atlantic #u-boat attack #escort defence #WWII Naval Battle #black may 1943

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#Convoy HX 237 #HX Convoy #battle of the atlantic #WWII Naval Convoy #allied convoy

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#Convoy HX 237 #HX Convoy Designation #allied convoy code #WWII Naval #battle of the atlantic

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#Convoy HX 237 #black may 1943 #u-boat defeat #battle of the atlantic turning point #escort victory #WWII Naval

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#Convoy HX 237 #halifax convoy #Canada UK Convoy #HX 237 Route #WWII Shipping