James Hanson is once again joined by Rear Admiral Dr Chris Parry and Jonathan Parshall, this time to discuss military campaign that never happened. Operation Downfall was the ambitious allied plan to invade Japan at the end of WW2, yet this was never put into action because of the atomic bomb. Yet what if the bomb wasn't available? The end of the war and the rest of the 20th century would have looked very different indeed. We've delved into our recent archive for this episode of History Undone.

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