On June 12, the Union cavalry destroyed Trevilian Station, several railcars, and about a mile of track on either side of the station. Concerned about the Confederates hovering near his flank, at about 3 p.m. Sheridan sent Torbert's division on a reconnaissance west on the Gordonsville and Charlottesville roads. They found Hampton's entire force in an L-shaped line behind some log breastworks two miles northwest of Trevilian. The Union cavalrymen launched seven assaults against the apex and shorter leg of the "L", but were repulsed with heavy losses. Two brigades of Fitzhugh Lee's division swung around to hit the Union right flank with a strong counterattack. The battle ended about 10 p.m. and the Union withdrew late in the night. It had been the bloodiest and largest all-cavalry engagement of the war. Sheridan, burdened with many wounded men, about 500 prisoners, and a shortage of ammunition, decided to withdraw. He planned a leisurely march back to Cold Harbor, knowing that Hampton would be obliged to follow and would be kept occupied for days, unavailable in that time to Robert E. Lee.