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WI with more luck and skill by comanders on behalf of the lawful government of the US Lee's return to the South were prevented and he was forced to surrender at some place North of the Potomac.
NB The emancipation proclamation (morally good tactically brilliant but legally iffy) applied only to states in rebellion by Janaury 1863, might that cause rebels to accept the US government rather than have their most powerful backers lose millions of dollars in human property?