STC355145 President Lincoln at Sharpsburg, October 1862 (b/w photo) by Brady, Mathew (1823-96) & studio; Private Collection; (add.info.: After the Battle of Antietam (also known as the Battle of Sharpsburg), fought on September 17th in Maryland; American Civil War; Allan Pinkerton (left) (1819-44) a Scottish detective and spy, founder of the Pinkerton National Detective Agency and head of the Union Intelligence Service 1861-62; John Alexander McClernand (right) (1812-1900) lawyer, politician and Union General;); The Stapleton Collection; American, out of copyright.