After the First Partition in 1772, Ostromecko was incorporated into the Kingdom of Prussia. Prussian authorities put up Ostromecki property for auction. In October 1794, during the Kościuszko Uprising, a unit of the Polish insurgent army under command of general Michał Sokolnicki, sent by general Dąbrowski, resided in the "Old Palace". Dąbrowski was on his way from Bydgoszcz to the area of Chełmno. After the defeat of Maciejowice, the insurgent army left and moved to Warsaw.