What happened when Jules Mazarin rode between the armies at Casale in 1630?

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Jules, Cardinal Mazarin Jules, Cardinal Mazarin, detail of a portrait by Philippe de Champaigne; in the Musée Condé, Chantilly, France.

On October 26, 1630, during the War of the Mantuan Succession, Jules Mazarin gained international fame for his bold actions at Casale. As opposing French and Spanish armies prepared for battle, Mazarin dramatically galloped between the two forces while shouting "Peace, peace!" as if a settlement had already been reached.1

This act of bravery effectively halted the immediate fighting, and the Spaniards subsequently raised their siege of Casale. For the remainder of his life, Mazarin was remembered as the intrepid diplomat who risked his own safety to prevent bloodshed. While this intervention was a significant moment in his career, it was only a preliminary step toward a broader resolution, which was eventually achieved through the Treaty of Cherasco in 1631.1