 Petersburg was supplied by rail along three remaining lines, the Richmond and Petersburg Railroad; the South Side Railroad, which reached to Lynchburg in the west; and the Weldon Railroad, also called the Petersburg and Weldon Railroad, which led to Weldon, North Carolina, and the Confederacy's only remaining major port, Wilmington, North Carolina.On June 22, Grant dispatched a 3,300 strong cavalry unit under the command of Brig.Gens.