In the book The Perfect Gentleman by Bernice-Marie Yates, George Washington Custis Lee, it states that Priv. Charles A Taggart captured the flag of Brig. Gen. Curtis Lee. (http://books.google.com/books?id=l8Z8e4-XIVEC&pg=PA353&dq=%22charles+a+taggart%22+flag)

It might help narrow the search.

Ed