Antietam National Battlefield - OH WOW Greeting Card - Mailable Viewer with 10 view cards - NEWAntietam National Battlefield OH WOW Greeting Card Mailable Viewer with 10 view cards 23,000 soldiers were killed, wounded or missing after twelve hours of savage combat on September 17, 1862. The Battle of Antietam ended the Confederate Army of Northern Virginias first invasion into the North and led to Abraham Lincolns issuance of the preliminary Emancipation Proclamation. 10 images each image has an informative descriptive text. Burnside Bridge