During the 1812 Campaign Württemberg served at the Headquarters of the 1st Western Army and fought at Vitebsk, Smolensk, Borodino, Tarutino (awarded Order of St. George, 3rd class), Maloyaroslavets, Vyazma and Krasnoi. In 1813 he commanded the Siege of Danzig for which he was awarded a golden sword and the Order of St. George (2nd class). After the war he returned to Belorussia and his Riga Regiment.