Frederick and the main Prussian army pressed on into northern Bohemia, looking to engage the Austrians under General Maximilian Ulysses Browne before they could join forces with the Saxons. Browne took up a defensible position by the village of Lobositz, where the two forces fought the Battle of Lobositz on 1October. The engagement ended inconclusively, with the Austrians inflicting significant losses on the Prussians and then retreating in good order; Frederick thus prevented Browne from reinforcing the isolated Saxons, but Browne stopped Frederick's advance into Bohemia. Turning back to the north, the Prussians fully occupied Saxony, even taking Prince-Elector Frederick Augustus II of Saxony prisoner, although he was allowed to withdraw to his other realms on 18 October. The Saxon army was briefly besieged at Pirna and surrendered on 14 October, after which its men were forcibly incorporated into the Prussian army under Prussian officers. Saxony's treasury was emptied and its currency debased to help fund the Prussian war effort.