One what date was the battle fought, that Simon Grundel-Helmfelt is most notable for?
Simon Grundel-Helmfelt Baron Simon Grundel-Helmfelt (1617–1677) was a Swedish field marshal and governor. Helmfelt is most notable for his overwhelming victory at the Battle of Lund despite being heavily outnumbered by Danish troops.
Battle of Fehrbellin The Battle of Fehrbellin was fought on June 18, 1675 (Julian calendar date, June 28th, Gregorian), between Swedish and Brandenburg-Prussian troops. The Swedes, under Count Waldemar von Wrangel (stepbrother of "Riksamiral" Carl Gustaf Wrangel), had invaded and occupied parts of Brandenburg from their possessions in Pomerania, but were repelled by the forces of Frederick William, the Great Elector, under his "Feldmarschall" Georg von Derfflinger near the town of Fehrbellin. Along with the Battle of Warsaw (1656), Fehrbellin was crucial in establishing the prestige of Frederick William and Brandenburg-Prussia's army.