Events in History
- American Civil War: The Allegheny Arsenal explosion results in the single largest civilian disaster during the war; 78 workers killed.
- Battle of Antietam [Battle of Sharpsburg], bloodiest day in the American Civil War: 22,000 dead, wounded or missing in first battle on Union soil
- Battle of Cumberland Gap, TN-evacuted by Federals
- Battle of Mumfordville, Kentucky, US Col J Wilder surrenders city
Deaths in History
- Lawrence O'Bryan Branch, American Brigadier General (Confederate Army), dies at 41
- William Edwin Starke, Confederate brigadier general, dies in battle at about 48