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It was administered with New East Prussia from 1795 onwards, until in 1807 it became part of the Napoleonic Duchy of Warsaw according to the Treaties of Tilsit.
In 1807 he was in Germany and took part in the siege of Colbert under the command of Murat and, after the Treaties of Tilsit, captured Stralsund.
From January to July 1807 the Department was known as the Białystok Department (Departament Białostocki) with the capital of Białystok, but after Treaties of Tilsit, Russia agreed for the creation of the Duchy of Warsaw, but in exchange it was ceded for powiats: Białostocki, Bielski, Sokólski and Drohicki.