ORDER OF BATTLE // May 21, 1809
Battle of Aspern-Essling
Estimated force strength by side, with confidence labels per surviving record.
Forces engaged
2 sides catalogued · combined 178,000 estimated
Austria
98,000
Medium-confidence figure
France
80,000
Medium-confidence figure
Battle context
The Battle of Aspern-Essling marked the first time Napoleon was personally defeated in a major battle and his first battle defeat in ten years, since the siege of Acre. It was also his first battle defeat as head of state. The engagement began when Napoleon crossed the Danube near Vienna, only for the French force of roughly 80,000 to be attacked and driven back across the river by Archduke Charles commanding approximately 98,000 Austrians. Although Archduke Charles succeeded in forcing the French withdrawal, he fell short of destroying their army. France suffered over 20,000 casualties, including Marshal Jean Lannes, described as one of Napoleon's ablest field commanders and closest friends. The battle demonstrated that Austrian forces, under capable leadership, could contest and reverse a Napoleonic offensive, carrying significant psychological and strategic weight within the War of the Fifth Coalition.
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