when was the battle of grunwald
Alternative Titles: Battle of GrÃ¼nfelde, Battle of Tannenberg, Battle of Zalgiris Battle of Grunwald, (First Tannenberg), (July 15, 1410), battle fought at Tannenberg (Polish: StÄbark) in northeastern Poland (formerly East Prussia) that was a major Polish-Lithuanian victory over the Knights of the Teutonic Order.