Prussian victory over the Austrian army 13 km/8 mi northwest of Hradec Kralove (German Königgrätz) 3 July 1866, ending the Seven Weeks' War. It confirmed Prussian hegemony over the German states and led to the formation of the North German Confederation 1867. It is named after the nearby village of Sadowa (Czech Sadová) in the Czech Republic.
The stars symbolize hope and equality between the ten parishes. Green reflects the island's lush vegetation. The red disc has socialist connotations. Effective date: 3 November 1990.