The July 1943 invasion of Sicily (Operation Husky) was a masterstroke of military planning and execution. It freed much of the Mediterranean Sea for Allied shipping, inflicted more than 175,000 casualties on the Axis forces, took down Benito Mussolini’s government, and knocked Italy out of the war. It’s stunning, in retrospect, to consider that it almost didn’t happen.  The Planning and Execution of Operation Husky American planners believed invading anything but the Italian mainland...