NPS CWS&SS shows:

Albert H. Pettigrew
Regiment Name 39th Batt'n. Virginia Cavalry
Side Confederate
Company C
Soldier's Rank_In 1 Lieutenant
Soldier's Rank_Out 1 Lieutenant
Film Number M382 roll 43

Co C = Lee's Body Guard, Co B; organized March 9, 1863 [some were enlisted by Albert H. Pettigrew as early as November 1862 & he was to be Captain of the company - he became 1st Lt. of the company upon organization, evidently uniting his recruits with those raised by Captain Samuel Bradford Brown].

39th Battalion, Virginia Cavalry
39th Cavalry Battalion [also called Richardson's Battalion of Scouts, Guides, and Couriers] was organized with two companies, later increased to four. It was attached to General Headquarters, Army of Northern Virginia, and served as General R.E. Lee's personal cavalry command. The unit participated in every engagement at which General Lee was present from Fredericksburg to Appomattox. On April 9, 1865, it contained 1 officer and 80 men. Major John H. Richardson was in command.

I would click on the box at the top of the page and order his compiled military records.