On June 20, Fitz Lee attempted to attack the Union supply depot at White House, but Sheridan's arrival relieved the garrison there. On June 21, Sheridan crossed over the Pamunkey River, leading 900 wagons toward the James River. On June 24, Torbert's division escorted the wagons as Gregg's division followed a parallel route, protecting the right flank. At about 8 a.m., Gregg's division pushed back Confederate pickets to the north and entrenched to the west of Samaria Church (identified in Federal reports as St. Mary's Church). From 3 to 4 p.m., Hampton's five brigades attacked Gregg's two. The pressure was too great on the Union cavalrymen and they began to withdraw down the road to Charles City Court House.