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 commanded by 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.
During the course of six years in the initial stages of the war, King Charles XII and the Swedish Empire had defeated almost all participants in the anti-Swedish coalition, which initially consisted of the Polish-Lithuanian Commonwealth, Denmark-Norway and the Tsardom of Russia. The latter, under Tsar Peter I, was the only one still fighting. Charles therefore chose to invade Russia in the autumn of 1707 and march towards Moscow with a large Swedish army. However, the campaign was complicated by harsh weather conditions and by Russian scorched earth tactics and surprise attacks, which forced Charles to interrupt his march on Moscow and instead march south to establish winter quarters with the help of Ivan Mazepa, hetman of the Cossack Hetmanate Zaporizhian Host.