northern bank of the river rather than on the islands. The work started in early 1807, yet went on very slowly. It was not until the following year that the pace was speeded up and in 1809 the first casemates and walls were ready. It was there that the core of the Polish Army was stationed after the Battle of Raszyn against the invading forces of Austria. Soon after the outer rim of defences on the right bank of the Vistula was ready. It ran more or less along the inner line of modern fortifications. It consisted of a semi-circular earthwork reinforced with wooden stockade and five bastions. In addition, the area was guarded by two fortified bridgeheads, one in Kazuń on the left bank of the Vistula and the other next to Nowy Dwór Mazowiecki. In 1810 the very concept of the fort was changed and Napoleon decided to turn Modlin into a pivotal fortress in his line of fortifications and expand it significantly by adding an outer rim of defenses. General de Chasseloup-Laubat was replaced with a famous French engineer Jean Mallet de Granville (later a naturalized Pole under the name of Jan Malletski), aided by Gen. François Haxo. It is not certain whether the authors of the expansion were the two to supervise its construction, or Napoleon himself. The works continued on a very fast pace as Napoleon was planning his campaign in Russia and envisioned Modlin to become the main fortress behind his lines. By September 1811 more than 19,000 people were taking part in the works. Because of that the authorities of the Duchy of Warsaw were considering to grant Modlin with a city charter, which however did not succeed. Although the following year, shortly before the outbreak of the Franco-Russian War, the number of workers exceeded 20 thousands, the fortress was never fully completed. The French plans included a fortified area composed of three, semi-independent fortifications. The main line of defences was located on the right bank of Vistula and Narew, and was composed of a polygonal fortification with 4 bastions and 3 linking ravelins (one facing the Utrata river, one facing the village of Modlin and one in the centre). The ravelins were between 800 and 1000 meters away from the main line of fortifications, in order to reinforce the defenses against new models of heavy artillery. The second part of the fortress