The Battle of Marignano took place from September 13 to September 14, 1515, during the Italian Wars. It was fought between the forces of the Kingdom of France, led by King Francis I, and the Duchy of Milan, supported by the Swiss Confederation. The battle was significant for its large scale and the use of artillery, marking a shift in military tactics of the time. The French army emerged victorious, which allowed Francis I to secure control over Milan. This victory solidified French influence in northern Italy and demonstrated the effectiveness of combined arms tactics, including infantry, cavalry, and artillery, in warfare.