How has the Antietam Battlefield changed and stayed the same over the years? Objective Students will be able to: Distinguish between past, present, and future time. Explain change and continuity over time. Draw upon the visual data presented in photographs, paintings, and drawings. Analyze illustrations in historical stories. Background The Battle of Antietam was the bloodiest single day in American History. On September 17, 1862 over 23,000 soldiers were killed, wounded or missing. The Battle of Antietam ended the Confederate Army of Northern Virginia's first invasion into the North and led t Duration: 90 Minutes.