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With the Lost Orders staying lost as our PoD, how successful could Robert E Lee's invasion of Maryland be, both in terms of achieving military and political (by which I mean affecting diplomacy and the midterms) objectives? And given such successes for the CSA, how would the war progress; and what would be the Confederacy's prospects in such a situation?

I will have more to say in the coming days, but one thing I will say for now: This remains my favorite ACW PoD.
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