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I'm working on a scenario where, due to a number of butterflies, the Nazis back down initially on the Sudetenland due to the Soviets getting involved. Sooner or later war still breaks out, and the Nazis take the opportunity to invade Czechoslovakia anyway. As I understand it, one of the main issues surrounding the Sudetenland was that that's where the Czechoslovaks had built most of their defences and fortifications. Now the full weight of Germany's military and their allies would inevitably have been able to break through in a headlong assault, but I was wondering if an attack from the south via Hungary, attacking through Slovakia, would have been able to circumvent said defences.
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