However, Hunter had two major problems. He was supposed to receive help from Maj. Gen. Philip Sheridan; who never showed up because he had suffered a major setback at the Battle of Trevilian Station and was forced to retreat to an area around Richmond and Petersburg. The other, and perhaps more important, issue was that Hunter's supply lines were being harassed by the 43rd Battalion Virginia Cavalry, under Lt. Col. John S. Mosby. Between May 20 and June 17, only one supply wagon had reached Hunter.