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]