The Prussians quickly defeated Saxony and incorporated the Saxon army into the Prussian army .
Frederick II of Prussia chose to attack preemptively and invaded Saxony in August 1756 , precipitating the Third Silesian War ( part of the Seven Years ' War ) .
The Prussia quickly defeated Saxony and incorporated the Saxony army into the Prussia army .
Frederick II of Prussia chose to attack preemptively and invaded Saxony in August 1756 , precipitating the Third Silesian War ( part of the Seven Years ' War ) .