Interesting read, Jimbuna. The Brits also used Enigma decodes to intercept supplies sailing to the Afrika Korps. Quite a lot of Rommel's supplies never reached him because the Royal Navy and the RAF knew their route at sea. The Brits were quite good at keeping it secret that they were reading the enemy's mail. Before intercepting these convoys, they would always fly a search plane overhead, which was the presumed cause of the interception. As Jimbuna posted, in spite of their suspicions, investigations and confidence in the security of Enigma led to the Germans' continued use of the same. One supply convoy was almost certain to reach Rommel as it sailed in fog. Although the Royal Navy had a reputation for intercepting their convoys, the Italians and Germans thought this particular one would surely get through. The Brits desperately wanted to nail that convoy, but had they done so in that weather, the Axis would have known something was up. The British were prepared to let that convoy get through if that was to be the price of keeping the cracking of Enigma secure. In spite of the odds against them, they sent up search planes, one of which happened to spot the convoy through a clear patch in the weather. The convoy was attacked; as far as the Axis knew, that search plane was the reason for the interception.
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