From the Richmond Dispatch, 9/16/1862
Yankee Officers. – The number of Pope's officers in the Libby prison was increased on Sunday evening by the addition of 1st Lieut. Wm. H. Clarke, of I company, 21st Massachusetts regiment, and 2d Lieut. Geo. C. Parker, of B company, same regiment. They were taken at the battle of Manassas.