 He fought against the Tard-Venus and against the local lords in the Auvergne who had taken to brigandage.In 1377 Sancerre was campaigning again in Guyenne and he took part in the siege of Bergerac, where he distinguished himself in capturing several local lords.After the death of du Guesclin both Coucy and Sancerre were offered the post of Constable but refused.