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Here's one. IOTL, the green Americans lost the Battle of Kasserine Pass, February 19-24, 1943, because of incompetent leadership. Major General Lloyd
R. Fredendall, the commander of Second Corps, had been placed there by General George C. Marshall, the Army Chief of Staff, because he thought that
he showed superior command ability. He was wrong. Fredendall turned out to
be an incompetent boob. However, Eisenhower, the Supreme Allied Commander, was afraid to fire Fredendall, because he was Marshall's man.
He finally did so right after Kasserine Pass and replaced him with Major General George S. Patton, Jr. What if Fredendall had been fired on the eve of
the battle, and replaced by Patton? What would the results have been?
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