Why Frederick the Great suffered his most catastrophic defeat at the Battle of Kunersdorf
In 1759, Frederick the Great marched his army into a trap of his own making. Despite early tactical successes, his failure to scout the terrain and his disregard for the exhaustion of his troops turned a potential victory into a total collapse, marking the Prussian army's darkest hour.
The Battle of Kunersdorf, fought on 12 August 1759, remains the most significant failure of Frederick the Great’s military career. Facing a combined force of 41,000 Russians and 18,500 Austrians, Frederick’s 50,900 Prussians initially gained momentum. The terrain, characterized by marshy meadows and a series of hillocks, had been heavily fortified by the Allied commanders, Pyotr Saltykov and Ernst Gideon von Laudon. By securing a causeway and entrenching along a ridge, the Allies effectively neutralized Frederick’s signature oblique order tactic.
Frederick’s downfall was rooted in poor intelligence and overconfidence. After a perfunctory reconnaissance, he incorrectly assumed the Allied line was vulnerable to a flanking maneuver through the dense, unstable Reppen Forest. His troops, already fatigued from forced marches and lacking hot meals, struggled to navigate the difficult landscape. Although the Prussians successfully captured the Mühlberge and seized nearly 100 enemy cannons by noon, Frederick ignored advice from his generals to consolidate his gains. Instead, he ordered a desperate assault against the heavily defended Grosser Spitzberg.
The subsequent Prussian attack was decimated by concentrated Allied artillery and fresh infantry reserves. By the end of the day, the Prussian army had disintegrated into an undisciplined mass, with only 3,000 soldiers remaining with the King. While the Allied commanders failed to capitalize on their victory due to internal disagreements, the battle represented a near-fatal blow to Prussia. It stood as the second-greatest achievement for the Russian Empire under Empress Elizabeth, leaving Berlin vulnerable and forcing Frederick to rebuild his shattered military forces from the ground up.
Source: Battle of Kunersdorf
