Treaty of Kalisz (1813)
The Treaty of Kalisz was signed in Kalisz
Kalisz is a city in central Poland with 106,857 inhabitants , the capital city of the Kalisz Region. Situated on the Prosna river in the southeastern part of the Greater Poland Voivodeship, the city forms a conurbation with the nearby towns of Ostrów Wielkopolski and Nowe Skalmierzyce...

 on 28 February 1813, between Russia
Russia or , officially known as both Russia and the Russian Federation , is a country in northern Eurasia. It is a federal semi-presidential republic, comprising 83 federal subjects...

 and Prussia
Prussia was a German kingdom and historic state originating out of the Duchy of Prussia and the Margraviate of Brandenburg. For centuries, the House of Hohenzollern ruled Prussia, successfully expanding its size by way of an unusually well-organized and effective army. Prussia shaped the history...

 against Napoleon I
Napoleon I
Napoleon Bonaparte was a French military and political leader during the latter stages of the French Revolution.As Napoleon I, he was Emperor of the French from 1804 to 1815...

. The events that led to this alliance date back to 30 December 1812, at Tauroggen when Lieutenant-General Ludwig Yorck von Wartenburg, on behalf of his Prussian troops, and General Hans Karl von Diebitsch
Hans Karl von Diebitsch
Count Hans Karl Friedrich Anton von Diebitsch und Narden was a German-born soldier serving as Russian Field Marshal....

 of the Russian Army signed the Convention of Tauroggen
Convention of Tauroggen
The Convention of Tauroggen was a truce signed 30 December 1812 at Tauroggen , between Generalleutnant Ludwig Yorck von Wartenburg on behalf of his Prussian troops, and by General Hans Karl von Diebitsch of the Russian Army...

. 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.
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