The convoys that sailed time and again across the Atlantic and Arctic oceans to bring vital supplies back to Britain faced one of the greatest and most deadly threats of the entire war. Hidden deep beneath the waves were the German U-boats, which wreaked havoc among the Royal and Merchant navies. This desperate struggle - sometimes known as the 'real battle of Britain - was vital to the outcome of the war. If the U-boat menace had not been met and defeated, Britain could very easily have been starved into submission. The war against the U-boats cost 100,000 lives. Nearly 200 Allied warships and 2500 Merchant ships were sunk during the fighting in this most terrible theatre of battle.
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