The largest sieges of the war, however, took place in Europe. The initial German advance into Belgium produced four major sieges: the Battle of Liège, the Battle of Namur, the siege of Maubeuge, and the siege of Antwerp. All four would prove crushing German victories, at Liège and Namur against the Belgians, at Maubeuge against the French and at Antwerp against a combined Anglo-Belgian force. The weapon that made these victories possible were the German Big Berthas and the Skoda 305 mm Model 1911 siege mortars, one of the best siege mortars of the war, on loan from Austria-Hungary. These huge guns were the decisive weapon of siege warfare in the 20th century, taking part at Przemyśl, the Belgian sieges, on the Italian Front and Serbian Front, and even being reused in World War II.