ORDER OF BATTLE // September 5, 1758
Battle of Zorndorf
Estimated force strength by side, with confidence labels per surviving record.
Forces engaged
2 sides catalogued · combined 75,590–88,000 estimated
Prussia
33,000–36,000
Medium-confidence figure
Russia
42,590–52,000
Medium-confidence figure
Battle context
The Battle of Zorndorf, fought on 25 August 1758 near the Prussian village of Zorndorf, pitted Frederick II's army of 33,000–36,000 against a Russian force under Count William Fermor numbering between 42,590 and 52,000. Despite the numerical disparity favoring Russia, the engagement ended without a decisive result: both armies held their ground and both sides claimed victory. The human cost was severe on each side, with Prussian casualties reaching 11,390–12,800 and Russian losses estimated at 16,000–17,000, making it one of the bloodiest engagements of the Seven Years' War. The tactical inconclusive outcome was nonetheless strategically consequential for Frederick, who had been compelled to redirect forces to confront a Russian advance into Prussian territory, illustrating the mounting pressure of fighting on multiple fronts simultaneously. The battle checked Fermor's operation without eliminating the Russian threat, a pattern that would define Prussia's grinding attritional struggle against Russia throughout the war.
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