I believe the memoirist in question is John H. Worsham. He was in Co F, 21st Virginia, eventually making first sergeant. He was wounded and permanently disabled in 1864.
His book is titled One of Jackson’s Foot Cavalry; his Experience and what he saw During the War 1861-1865, Including a History of “F Company,” Richmond, Va., 21st Regiment Virginia Infantry, Second Brigade, Jackson’s Division, Second Corps, A. N. Va.
John Henry Worsham (8 July 1839 - 19 September 1920)
He was the author of the memoirs entitled One of Jackson's Foot Cavalry: His Experience and what He Saw During the War 1861-1865, Including a History of "F Company," Richmond, Va., 21st Regiment Virginia Infantry, Second Brigade, Jackson's Division, Second Corps, A. N. Va., New York, The Neale Publishing Company, 1912. https://www.findagrave.com/memorial/27011277/john-henry-worsham
John H. Worsham - "One of Jackson's Foot Cavalry; his experience and what he saw during the war 1861-1865, including a history of "F company," Richmond, Va., 21st regiment Virginia infantry, Second brigade, Jackson's division, Second corps, A. N. Va." - 1912