Battle of Bosco Marengo
Part of the Wars in Lombardy and the Milanese War of Succession
Bartolomeo Colleoni in armor [1]
Date October 11, 1447[2] Location Bosco Marengo, Piedmont Result Ambrosian victory[1][3][4]
Belligerents
Golden Ambrosian Republic	Duchy of Orléans
Commanders and leaders
Bartolomeo Colleoni Astorre II Manfredi [1][5][6][7]	Renaud du Dresnay (P) [1][3][5][8]
Strength
3,700 troops[6]	3,000 troops[5][9]
Casualties and losses
500 killed [10][6][11]	1,500 killed [10][8][11] only half could retreat back to France [9] 300 captured [10][11]

The Battle of Bosco Marengo (aka Battle of Frascata) ^[3] was fought in the autumn of 1447.

The Duke of Orleans, Charles I, son of Valentina Visconti, laid claim to the Duchy of Milan^[10] and dispatched an army from the Dauphiné and Lyonais under Renaud du Dresnay into Lombardy.^[5] The Golden Ambrosian Republic responded and dispatched a total of 3,700 troops under Colleoni to Alessandria.^[6] At Bosco Marengo, battle was joined and the French suffered a complete defeat^[12] with their general Renaud du Dresnay being captured and later ransomed for 14,000 'couronnes'.^[13]

Sources