When Frederick learned of the fall of Breslau, his 22,000 men marched in twelve days to regroup with the retreating Prussian troops from Breslau at Liegnitz. The augmented army of about 33,000 men arrived near Leuthen, west of Breslau, to find 66,000 Austrians in formation around the village. Despite his troops' fatigue from the rapid march, Frederick engaged the superior Austrian force on 5December and won another unexpected victory in the Battle of Leuthen. The Prussians pursued Prince Charles's defeated army all the way back to Bohemia, while the Austrian and French forces still within Breslau were besieged until their surrender on 19–20 December, bringing the bulk of Silesia back under Prussian control.