The Battle of Poltava (8 July 1709) was the decisive and largest battle of the Great Northern War. The Russian army under the command of Tsar Peter I defeated the Swedish army under the command of Carl Gustaf Rehnskiöld. The battle put an end to the status of the Swedish Empire as a European great power, as well as its eastbound expansion, and marked the beginning of Russian supremacy in eastern Europe. .
https://en.wikipedia.org/wiki/Battle_of_Poltava