Birney and one division of XXV Corps under Brigadier General John W. Turner to take over lines on the south side of the Appomattox River. This freed two corps of Major General George Meade's Army of the Potomac for offensive action against Lee's flank and railroad supply lines: Major General Humphrey's II Corps and Major General Warren's V Corps. Grant ordered these corps, along with Major General Philip Sheridan's cavalry (First Division of Brigadier General Thomas Devin and the Third Division of Brigadier General (Brevet Major General) George Armstrong Custer but both under the overall command of Brigadier General (Brevet Major General) Wesley Merritt as an unofficial corps commander and the Second Division of Major General George Crook detached from the Army of the Potomac), still designated the Army of the Shenandoah, to move west, with the cavalry first taking control of Dinwiddie Court House and severing the Boydton Plank Road at that location. Lee's orders Lee, who was already concerned about the ability of his weakening army to maintain the defense of Petersburg and Richmond, realized that the defeat at Fort Stedman would encourage Grant to make a move against his supply lines and right flank. Lee already had prepared to send some reinforcements to his right flank, the southwestern end of his line. Early in the day on March 29, Lee sent Major General George Pickett with three of his brigades commanded by Brigadier Generals William R. Terry, Montgomery Corse and George H. Steuart via the deteriorated South Side Railroad to Sutherland Station. The trains shuttling the troops to Sutherland Station were so slow that it was late night before the last of Pickett's men reached their destination, west of Petersburg. From Sutherland Station, Pickett moved south on Claiborne Road to White Oak Road and Burgess Mill, near the end of the Confederate line. There he added the two brigades of Brigadier Generals Matt Ransom and William Henry Wallace from Major General Bushrod Johnson's division, along with a six-gun battery under Colonel William Pegram to deploy to Five Forks with his three brigades. Battle of Lewis's Farm On March 29, 1865, Warren's corps led by the First Brigade of Brigadier General (Brevet Major General) Charles Griffin's First Division under the command of Brigadier General Joshua Chamberlain proceeded up the Quaker Road toward its intersection with the Boydton Plank Road and the Confederates' nearby White Oak Road Line. The