20 September 1862: Saturday

Union - Government
In the White House, President Lincoln prepares the preliminary Emancipation Proclamation, long discussed by Cabinet and President.

Union - Military
Maryland
McClellan sends two divisions across the Potomac in a mild pursuit of Lee. Opposed by A.P. Hill, the Union troops fell back and Lee's army withdraws to the valley of Opequon Creek. The active part of the campaign ends with fighting near Shepherdstown, Hagerstown. Williamsport, and Ashby's Gap.

Mississippi
There is a skirmish on Fulton Road south of Iuka.

Kentucky
There is a skirmish at Munfordville.

Missouri
There is a skirmish at Shirley's Ford on Spring River near Carthage.

Tennessee
From this day to the 22nd there is a Union expedition from Bolivar to Grand Junction and La Grange.

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Bibliography
The Civil War Day By Day: An Almanac 1861-1865. E.B. Long with Barbara Long, De Capo, 1971