His rule was largely weak and ineffective, as much of government responsibilities in Brandenburg-Prussia was turned over to Schwarzenberg as the country suffered greatly during the war. Protestant and Catholic troops alike burned and plundered the Brandenburg region and the population was decimated there as it was throughout the German states. Whereas Ducal Prussia remained mostly untouched. With _his_ brother-in-law Gustavus dead in 1632, George William maintained the Swedish alliance until after the Swedish defeat at the Battle of N*rdlingen on 6 September 1634. <sep>, Pronoun: his