If anyone is aware of primary sources (letters, diaries, memoirs, &c.) dealing with Brigadier General Samuel McGowan's Brigade during the Petersburg Campaign, please pass that information along to me. The brigade consisted of the 1st (Gregg's), 12th, 13th, and 14th regiments and Orr's Rifles. I am familiar with the books by Caldwell, Berry, and Dunlop.