The Battle of Poltava took place 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 would lead to the Swedish Empire losing its status as a European great power and also marked the beginning of Russian supremacy in eastern Europe. .
https://en.wikipedia.org/wiki/Battle_of_Poltava