Three days after the battle, following a cease-fire, Stonewall Jackson's force withdrew to Gordonsville. Most of the Confederate dead and at least 405 Federal soldiers were buried on the field, and all but one, N.B. Phillips, were in unmarked graves. The Union army occupied the field for about a week after the battle. Working for Mathew Brady, photographer Timothy O'Sullivan visited the field and captured images of the landscape covered in tents and soldiers exploring the wreckage of the battle. At the start of the Second Manassas Campaign, Cedar Mountain returned to Confederate control, and soldiers drilling on the field held contests to see who could pick up the most bullets without breaking formation, with the winner usually collecting thirty or forty spent rounds. In 1902, Culpeper County resident and Confederate veteran Daniel A. Grimsley oversaw the installation of over 60 stone markers indicating the positions of regiments and batteries during the battle. An early preservationist, he became the unofficial ambassador of the Cedar Mountain battlefield, organizing reunions and memorials until his death in 1910. On November 2, 1902, he gave a tour to President Theodore Roosevelt and presented him with an excavated cannon shell. The battlefield is preserved by the Civil War Trust in cooperation with the Friends of Cedar Mountain Battlefield and area landowners, whose stewardship has left this ground mostly intact since 1862.