The War For the Union – A Slave Pen in Alexandria Tom Faces & Places of Yesterday Tue Jul 2nd, 2013 3 Comments This is an incredible stereographic card, taken during the Civil War. It’s a powerful image of an Alexandria slave pen. Photograph shows soldiers inside prison area where slaves were held. Source: Library of Congress Amazon.com Widgets email Tags 1860s, Alexandria VA, slaves, The Civil War spottieottie Any idea where in Alexandria this was? Jarkress Gray house, still standing at 1315 duke St. Slave pens were to either side of the house. See: http://www.loc.gov/pictures/resource/cwpbh.03340/ Tania Is this is the same slave pen referred to in the book 12 Years a Slave?