 Maximilian von Browne commanded the Austrian troops . Following the indecisive Battle of <unk> in 1756 , he was replaced by Prince Charles Alexander of Lorraine , Maria Theresa 's brother @-@ in @-@ law . Frederick was startled by <unk> ; he eventually re @-@ grouped for another attack in June 1757 . The Battle of Kolin that followed was a decisive victory for Austria . Frederick lost one third of his troops , and before the battle was over , he had left the scene . However , later that year he won a spectacular victory against the Austrians at Leuthen , which secured Prussian control of Silesia for the rest of the war . 
