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 Protestant Union, led by Gustavus Adolphus of Sweden, and the Catholic League, 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 Protestant forces achieved a decisive victory at Breitenfeld, which boosted morale among Protestant states in Europe. This battle demonstrated the importance of artillery and coordinated infantry movements, influencing future military strategies in the conflict.