Treaty of Kalisz (1813)
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The Treaty of Kalisz was signed in Kalisz on February 28, 1813 between Russia and Prussia against Napoleon I. The events that led to this alliance date back to December 30, 1812 at Tauroggen when Lieutnant-General Johann David Ludwig Graf Yorck von Wartenburg, on behalf of his Prussian troops, and General Hans Karl von Diebitsch of the Russian Army signed the Convention of Tauroggen. The Convention of Tauroggen armistice, signed by Diebitsch and Yorck, "neutralized" the Prussian corps without consent of their king. The news was received with the wildest enthusiasm in Prussia, but the Prussian Court dared not yet throw off the mask, and an order was dispatched suspending Yorck from his command pending a court-martial. Two months later, the Prussians officially switched sides when both Prussia and Russia agreed to establish an alliance known as the Kalisz Union against Napoleon I.
