The Battle of Breitenfeld took place on September 17, 1631, during the Thirty Years' War. It was a significant conflict between the forces of the Swedish Empire, led by Gustavus Adolphus, and the Holy Roman Empire, commanded by Johann Tserclaes, Count of Tilly. The battle marked a turning point in the war, showcasing the effectiveness of the Swedish military tactics. The Swedish army achieved a decisive victory, which boosted their influence in Germany and encouraged other Protestant states to join their cause. This battle demonstrated the importance of artillery and coordinated infantry tactics, reshaping future military strategies in Europe.