Poitiers' feudal lord, the Duke of Normandy (later King John II of France), had ordered him to counterattack the English here so that Normandy was free to advance from La Réole to the North.
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Derby used this opportunity to seize more towns in the region including Montségur and conduct successful sieges against La Réole and Aiguillon, placing the region firmly in English hands.
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Amongst the other places he took before retreating back to Bordeaux for fresh troops and supplies was Auberoche, and in mid-October it became the first position counterattacked by a 7,000 strong French army under Louis of Poitiers.
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Further battles included the battle of Auberoche, the siege of Aiguillon, from where he escaped prior to its lifting, a raid on Barfleur and the English victory at the Battle of Crecy, on 26 August 1346.
Manny also took part in the campaigns of the Earl of Derby in Guyenne, being present at the battles of Bergerac and Auberoche.