He enlisted May 13, 1862 and served in Co. D, 21st Battalion, Georgia Cavalry. It appears as though he was transferred to the 20th Battalion, Georgia Cavalry and then transferred Co. E, 7th Georgia Cavalry.
W.T. Green was with General Lee when he surrendered at Appomattox April 9, 1865.
William married Lupina Prescott Livingston, a widow, in about 1861. William and Lupina had no children although Lupina had a daughter by her first husband.