I am working on a biography of Dr. Patrick Gregg of Rock Island, Illinois. He was Captain of K Company of the 58th Illinois and was captured with Prentiss. His post POW career was with the 23rd Illinois as its Surgeon. The attached file is an attempt to give context to Gregg's Shiloh's personal experience there. Critique and corrections are welcome.
Biography of Patrick Gregg p1-9 Context.pdf