An Anglo-Gascon Army commanded by Henry of Grosmont, Earl of Derby, defeated a French force under Henri de Montigny, Seneschal of Périgord, outside the walls of Bergerac, leading to the loss of the town.
Manny also took part in the campaigns of the Earl of Derby in Guyenne, being present at the battles of Bergerac and Auberoche.
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He accompanied the heir to the throne, the future King Louis XI of France, on campaign in Germany in 1444 and served in many of the successful sieges which brought the Hundred Years' War to an end, including those of Taillebourg, Le Mans, Château Gaillard, Rouen, Bayeux, Caen, Cherbourg, and Bergerac.