Following Napoleon Bonaparte's victory in the War of the Fourth Coalition and the Greater Poland Uprising of 1806 the Province of New East Prussia was ceded according to the 1807 Treaties of Tilsit:

Following Napoleon Bonaparte's victory in the War of the Fourth Coalition and a Polish uprising, the territory of South Prussia became part of the Duchy of Warsaw, a French client state, according to the 1807 Treaties of Tilsit.

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