The Battle of Prague, which occurred between 25 July and 1 November 1648 was the last action of the Thirty Years' War. While the negotiations for the Peace of Westphalia were proceeding, the Swedes took the opportunity to mount one last campaign into Bohemia. The main result, and probably the main aim, was to loot the fabulous art collection assembled in Prague Castle by Rudolf II, Holy Roman Emperor (1552–1612), the pick of which was taken down the Elbe in barges and shipped to Sweden. After occupying the castle and the western bank of the Vltava for some months, the Swedes stopped assaulting the Old and New Town at the eastern bank when news of the signing of the treaty reached them. They still remained a garrison on the western bank until their final withdrawal on 30 September 1649. It was the last major clash of the Thirty Years' War, taking place in the city of Prague, where the war originally began 30 years earlier. Overview General Hans Christoff von Königsmarck, commanding Sweden's flying column, entered the city, which was defended by the Governor Feldmarschall Rudolf von Colloredo, a veteran of the siege of Mantua and of the battle of Lutzen, where he served under Albrecht von Wallenstein. The Swedes by a sudden night raid conquered whole part of Prague on the left (western) bank of the Vltava river – i.e. Prague Castle and quarters Hradčany and Lesser Town – and completely looted those rich districts. Two days later they attempted to enter the Old Town on the eastern bank of the river, but were repulsed on the Charles Bridge by Colloredo's men. When a third Swedish army commanded by Prince Carl Gustaf came close to Prague (25 September), all three Swedish armies launched a number of attacks against the city – not only from west, via the Charles Bridge, but also from north (bombardment from the Letná Plain) and especially from eastern plains, towards another city quarter, the New Town. These attacks were repelled largely thanks to the skill of the Feldmarschall and the energy of his troops, as well the fierce resistance of the burghers' militia and student volunteer troops (Academic Legion) under Czech Jesuit priest Jiří Plachý and German jurist Hans Georg Kauffer. Sack of Prague Unable to enter the other half of the city, the Swedes settled for looting the castle and surrounding palaces and monasteries;