In the following months Prince Henry led a secondary army into Saxony, where he engaged the Austrian defenders of Dresden near Freiberg on 29 October; the Battle of Freiberg saw the defenders shattered and pursued back to Dresden, after which Prussian forces occupied the majority of Saxony. Prince Henry's army pursued some "Reichsarmee" forces into Franconia and raided pro-Austrian principalities in the Holy Roman Empire in November and December. In November Maria Theresa proposed to open peace negotiations, to which Frederick immediately agreed; on 24 November the two belligerents declared an armistice in Saxony and Silesia, and formal peace talks began in late December.