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In page History of Germans in Russia, Ukraine, and the Soviet Union:

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Napoleon's victories ended the short existence of South Prussia. The French Emperor incorporated that and other territories into the Duchy of Warsaw. After Napoleon's defeat in 1815, however, the Duchy was divided. Prussia annexed the western Posen region, and what is now central Poland became the Russian client-state known as Congress Poland. Many Germans continued to live in this central region, maintaining their middle-German Prussian dialect, similar to the Silesian dialect, and their Protestant and Catholic religions. (The Russian population was primarily Russian Orthodox, which was the established national church.)[citation needed]