sentences:  Having forced Denmark–Norway to make peace within months, King Charles turned his attention upon the two other powerful neighbors, King August II (cousin to both Charles XII and Frederick IV of Denmark–Norway) and Peter the Great of Russia, who also had entered the war against him, ironically on the same day that Denmark came to terms.Russia had opened their part of the war by invading the Swedish-held territories of Livonia and Estonia.Charles countered this by attacking the Russian besiegers at the Battle of Narva (November 1700).