During Napoleon's invasion of Prussia during the War of the Fourth Coalition, the town was besieged from mid-March to 2 July 1807 by the Grande Armée and by Polish forces drawn from insurgents against Prussian rule (a street named after General Antoni Paweł Sułkowski, who led Polish soldiers, is located within the present-day city). As a result of forced conscription, Poles were also among Prussian soldiers during the battle. The city's defense, led by then Lieutenant-Colonel August von Gneisenau, held out until the war was ended by the Treaty of Tilsit. Kolberg became part of the Prussian province of Pomerania in 1815, after the final defeat of Napoleon; until 1872, it was administered within the Fürstenthum District ("Principality District", recalling the area's former special status), then it was within Landkreis Kolberg-Körlin.