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. Gregg's division escaped relatively intact and the supply wagons were unmolested. Having been blocked by Hampton's cavalry, Sheridan withdrew on June 25 and moved through Charles City Court House to Douthat's Landing, where the trains crossed the James on flatboats. His cavalry followed on June 27 and 28. The Confederate cavalry attempted to position themselves for another attack, but the Union force was too strong and the Southern horsemen were too worn out. Hampton received orders from Robert E. Lee to continue quickly to Petersburg to deal with the Wilson-Kautz Raid against railroads south of the city. His men crossed the James on a pontoon bridge at Chaffin's Bluff, also on June 27 and 28. Sheridan's raid to Trevilian Station and back to the Army of the Potomac achieved mixed results. He successfully diverted Confederate attention from Grant's crossing of the James, but was unsuccessful in his objective of cutting the Virginia Central Railroad, a critical supply line to the Confederate capital and Lee's army. He also suffered relatively heavy casualties—particularly in his officer corps—and lost a large number of his horses to battle and heat exhaustion. And yet Sheridan claimed his raid was an undeniable victory. In his 1866 official report on operations he wrote, "The result was constant success and the almost total annihilation of the rebel cavalry. We marched when and where we pleased; were always the attacking party, and always successful." The results of Hampton's cavalry activities against Sheridan were also mixed, but are usually seen in a more positive light than Sheridan's. He had succeeded in protecting the railroads and, indirectly, Richmond. He achieved tactical victories on the second day of Trevilian Station and against Gregg at Samaria Church, but failed to destroy the Union cavalry or its trains. In August, he was named commander of the Cavalry Corps of the Army of Northern Virginia, filling the position that had remained open since the death of J.E.B. Stuart. Aftermath Grant's crossing of the James altered his original strategy of attempting to drive directly on Richmond, and led to the siege of Petersburg. After Lee learned that Grant had crossed the James, his worst fear was about to be