During the American Civil War, Delhi and Monroe, the seat of Ouachita Parish, were overcrowded with unwelcome refugees from rural areas to the east when the forces of General U.S. Grant moved into northeastern Louisiana. Grant spent the winter of 1862-1863 at Winter Quarters south of Newellton in Tensas Parish in preparation for the siege of Vicksburg, Mississippi. He did not take the river port city until July 4, 1863. Historian John D. Winters reported "strong Union sympathy" in both Delhi and Monroe.