23 American History Questions Most Americans Get Wrong

11. What was the deadliest battle in American history?

Correct: The Battle of Antietam
Incorrect: The storming of Normandy (D-Day)

While there were at least 4,414 identified Allied deaths on D-Day, that doesn’t compare to the number of lives lost during the Battle of Antietam on September 17, 1862. Right outside of Sharpsburg, Maryland, the brutal battle of the Civil War resulted in almost 23,000 American casualties.