The War For the Union – A Slave Pen in Alexandria Tom Faces & Places of Yesterday Tue Jul 2nd, 2013 3 Comments Share : tweet 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 Tags 1860s, Alexandria VA, slaves, The Civil War Share : tweet 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?