On the second and last day of the Battle of Aspern-Essling (near Vienna, Austria), Napoleon I is defeated in a major battle for the first time in his career, and repelled by an enemy army for the first time in a decade.

In the Battle of Aspern–Essling, Napoleon crossed the Danube near Vienna, but the French and their allies were attacked and forced back across the river by the Austrians under Archduke Charles. It was the first time Napoleon had been personally defeated in a major battle, as well as his first…