CASUALTY RECORD // June 10, 1807
Battle of Heilsberg
Estimated casualties — killed, wounded, captured, and missing — by side, with confidence labels per surviving record.
Casualties by side
2 sides catalogued · combined 14,000 estimated
French Empire
8,000
Medium-confidence figure
Russian Empire
6,000
Medium-confidence figure
Battle context
The Battle of Heilsberg on 10 June 1807 was a significant but inconclusive engagement during the War of the Fourth Coalition. Murat's French corps attacked Bennigsen's Russian force ahead of schedule, and the French assaults produced no tangible results by nightfall, after which an operational armistice was concluded. Despite holding a numerical disadvantage — French forces numbered between 50,000 and 64,500 against a Russian force of 90,000 to 95,000 — the French suffered higher casualties (approximately 8,000) compared to the Russian 6,000. Napoleon's intention to reinforce and press the engagement was frustrated when Bennigsen disengaged and moved toward Königsberg, preserving the Russian army's operational freedom. The battle thus failed to deliver the decisive blow Napoleon sought, though it preceded the engagement at Friedland days later, where the campaign's outcome would ultimately be settled.
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