Second only to Mathew Brady as the foremost early American photographer was Alexander Gardner, the one-time manager of Brady's Washington salon and Brady's chief photographer in the field during the early days of the Civil War. Indeed, Gardner, who later photographed the War independently, often managed the famous horse-drawn photographic laboratory and took many of the pictures that used to be attributed to Brady. He accompanied the Union troops on their marches, their camps and bivouacs, their battles, and on their many hasty retreats and routs during the early days of the War...