Despite the loss of their Russian auxiliaries, the Prussians engaged Daun's army on 21 July near Burkersdorf, north-east of Schweidnitz. Frederick persuaded Chernyshev to support the attack, not by actually fighting, but merely by remaining in the area and presenting a potential threat to the Austrians. The resulting Prussian victory in the Battle of Burkersdorf led to the recovery of most of Silesia from Austrian control. Daun's forces withdrew to Glatz, and the Prussians besieged Schweidnitz, recapturing it at length on 9October. Prussia had won its final Silesian campaign.