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1759–1760

Prussia suffered several defeats in 1759. At the Battle of Kay, or Paltzig, the Russian Count Saltykov with 40,000 Russians defeated 26,000 Prussians commanded by General Carl Heinrich von Wedel. Though the Hanoverians defeated an army of 60,000 French at Minden, Austrian general Daun forced the surrender of an entire Prussian corps of 13,000 in the Battle of Maxen. Frederick himself lost half his army in the Battle of Kunersdorf (now Kunowice, Poland), the worst defeat in his military career and one that drove him to the brink of abdication and thoughts of suicide. The disaster resulted partly from his misjudgment of the Russians, who had already demonstrated their strength at Zorndorf and at Gross-Jägersdorf (now Motornoye, Russia), and partly from good cooperation between the Russian and Austrian forces. However, disagreements with the Austrians over logistics and supplies resulted in the Russians withdrawing east yet again after Kunersdorf, ultimately enabling Frederick to re-group his shattered forces.

The French planned to invade the British Isles during 1759 by accumulating troops near the mouth of the Loire and concentrating their Brest and Toulon fleets. However, two sea defeats prevented this. In August, the Mediterranean fleet under Jean-François de La Clue-Sabran was scattered by a larger British fleet under Edward Boscawen at the Battle of Lagos. In the Battle of Quiberon Bay on 20 November, the British admiral Edward Hawke with 23 ships of the line caught the French Brest fleet with 21 ships of the line under Marshal de Conflans and sank, captured, or forced many of them aground, putting an end to the French plans.

The year 1760 brought yet more Prussian disasters. The general Fouqué was defeated by the Austrians in the Battle of Landeshut. The French captured Marburg in Hesse and the Swedes part of Pomerania. The Hanoverians were victorious over the French at the Battle of Warburg, their continued success preventing France from sending troops to aid the Austrians against Prussia in the east.

Despite this, the Austrians, under the command of General Laudon, captured Glatz (now Kłodzko, Poland) in Silesia. In the Battle of Liegnitz, Frederick scored a strong victory despite being outnumbered three to one. The Russians under General Saltykov and Austrians under General Lacy briefly occupied his capital, Berlin, in October but could not hold it for long. Still, the loss of Berlin to the Russians and Austrians was a great blow to Frederick's prestige as many pointed out that the Prussians had no hope of occupying temporarily or otherwise St. Petersburg or Vienna. In November 1760, Frederick was once more victorious, defeating the able Daun in the Battle of Torgau, but he suffered very heavy casualties, and the Austrians retreated in good order.

Meanwhile, after the battle of Kunersdorf, the Russian army was mostly inactive due mostly to their tenuous supply lines. Russian logistics were so poor that in October 1759, an agreement was signed under which the Austrians undertook to supply the Russians as the quartermaster's department of the Russian Army was badly strained by the demands of Russian armies operating so far from home. As it was, the requirement that the Austrian quartermaster's department supply both the Austrian and Russian armies proved beyond its capacity, and in practice, the Russians received little in the way of supplies from the Austrians. At Liegnitz (now Legnica, Poland), the Russians arrived too late to participate in the battle. They made two attempts to storm the fortress of Kolberg, but neither succeeded. The tenacious resistance of Kolberg allowed Frederick to focus on the Austrians instead of having to split his forces.