By Wednesday, July 13, 1864 Early’s frustrated Confederates who unsuccessfully attacked Washington gathered at Leesburg on the Potomac River, preparing to retreat into the safety of northern Virginia. Union commander Ulysses Grant ordered General Horatio Wright and two corps of Union troops, approximately fifteen thousand men, to pursue Early’s force. Skirmishing both at Rockville, Maryland on the 13th and Poolseville, Maryland on the 14th did not impede Early’s withdrawal across the Potomac. General Wright could only inform the Union War Department that Early’s force crossed the Potomac before sufficient Union forces could prevent him from doing so and advised against pursuing Early into northern Virginia. Early’s raid against Washington was not successful. It did not relieve Union pressure against besieged Petersburg nor materially change the outcome of the war.