Battle of Marignano

The Battle of Marignano, fought on 13 and 14 September 1515, pits the army of Francis I, recently crowned King of France, against the formidable Swiss foot soldiers supporting Duke Maximilian Sforza of Milan. After crossing the Alps by a bold maneuver via the Col de Larche, the French army descends rapidly into Lombardy. The Swiss, renowned for their discipline and fighting spirit, attack the French near Marignano at dusk. The first day of combat is of extreme intensity: the Swiss partially break the French dispositions. However, the arrival during the night of the Venetian army, allied with France and commanded by Bartolomeo d'Alviano, allows the French lines to be reinforced. The next day, French forces counterattack. Thanks to the combination of heavy cavalry, artillery, and infantry, Swiss troops are finally repulsed, defeated, and forced to withdraw, ending their control of the Duchy of Milan.

In 1515, Francis I accedes to the throne and relaunches French ambition in Italy, following in the footsteps of Charles VIII and Louis XII. France claims the Duchy of Milan, occupied by the Swiss on behalf of Maximilian Sforza. The Swiss Confederates had until then been highly effective allies of the Habsburgs and enjoyed a reputation as elite, disciplined, and aggressive troops. To surprise the enemy, Francis I crosses the Alps with a well-organized army, using a detour route to avoid main defenses. His descent into Lombardy catches the Swiss off guard. The battle unfolds as the French are still consolidating their position around Marignano. Clash is inevitable. Marignano is the first great battle of Francis I's reign, and it marks a turning point in the rivalry between France, the Italian states, and the Habsburgs.

The Battle of Marignano is characterized by the violence and tenacity of the fighting. The Swiss, deployed in deep columns of pikemen, attack frontally repeatedly, attempting to overwhelm French positions with compact charges. Francis I opposes a mobile defense articulated around three components: abundant artillery positioned strategically to break enemy columns, heavy cavalry (notably French gendarmes) delivering powerful countercharges, and disciplined infantry (notably German landsknechts engaged by France) capable of absorbing shocks and exploiting breaches. The arrival of the Venetian army on the night of 13–14 September allows the front to be extended and the Swiss assault to be disorganized. On the 14th, the French counterattack with coordination. Artillery plays a major role in slowing Swiss movements, while French cavalry pursues the exploitation of breakthroughs. Despite their courage and discipline, the Swiss, exhausted, finally retreat, abandoning the battlefield. The battle marks a turning point in military history through the decisive combination of cavalry, artillery, and professional infantry against reputed invincible pikemen.

Victory at Marignano allows Francis I to reconquer the Duchy of Milan, which he has administered on France's behalf by his ally Francesco II Sforza. It establishes the new king's military legitimacy from the early years of his reign and places him as a major actor in European politics. The battle also brings a change in Franco-Swiss relations. A few months later, on 29 November 1516, the Perpetual Peace is signed between France and the Swiss Confederates, ending a long series of armed conflicts between the two entities. This lasting peace seals Swiss neutrality toward France for several centuries. Moreover, the victory strengthens Francis I's Italian alliances, notably with Venice. Culturally, Marignano becomes a powerful symbol of Francis I's chivalric heroism, long glorified in French monarchical historiography. However, despite this victory, French domination over the Milanese would remain contested in the decades that followed.