At the outbreak of the Civil War, White enlisted in Captain
Daniel T. Shreve's
Loudoun Cavalry, where he quickly rose to the rank of
corporal. His service with the unit was short, and in June 1861 he joined Company C in Lieutenant Colonel
Turner Ashby's
7th Virginia Cavalry. during the
Battle of Ball's Bluff. For his service in the fight, White was given a captain's commission and ordered to raise a company of men For the final months of the war, White and the 35th were a part of the celebrated "
Laurel Brigade." Following the
Battle of High Bridge on April 6, 1865, in which General
James Dearing was fatally wounded, White was placed in command of that brigade. Four days later, White disbanded the Laurel Brigade and the 35th. Nearly a month later on May 8, White was paroled in
Winchester. ==Postbellum life==