An oversimplification PDQ. Had the Poles not provided England with a working copy of the Enigma code machine, and our scientists been unable to break the codes, we would have lost the war in Europe. Radar was a significant factor, but so was the invention of Asdic. Anti submarine warfare devices and techniques were far important than proximity fuses. Getting the USA to implement Merchant Ship Convoy systems was another reason. Churchill was already working with scientists, and developing the secret service liason way ahead of 1939. Read A Man called Intrepid (Canadian- Sir William Stephenson)
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