XII (1st Royal Saxon) Corps, a unit of the Imperial German Army prior to and during World War I
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Gordon commanded a brigade in XII Corps, Army of the Potomac, at the Battle of Antietam, becoming acting division commander when Brig. Gen. Alpheus S. Williams became acting corps commander.
Union Maj. Gen. John A. McClernand's XII Corps of the Army of the Tennessee occupied the plantation on April 29, 1863, after marching across the base of Coffee Point from Hard Times Plantation.
The largest group of encircled forces comprised the divisions of XII Corps, which remained relatively intact, along with those elements of XXVII Corps that had successfully retreated from Orsha and which were now trapped near Pekalin (in Smalyavichy Raion, Minsk Region).