Civil War usage - #65 with Alexandria, VA full-date postmark - Oct 7 1862

On October 7, 1862, Alexandria, Virginia, was a heavily fortified Union stronghold and the primary logistics hub for the Army of the Potomac. The city had been under Union occupation since May 24, 1861, and by October 1862, it functioned as a vital hospital and transportation center following the massive casualties of Second Manassas (August) and Antietam (September).