With impunity and wanting to increase his fortune, he attacked the county of Chartres, which was then in the dowry of his future mother-in-law Adela of Normandy, mother of Theobald II, Count of Champagne.
The king summoned a council in Melun, where the Archbishop of Sens and the bishops of Orleans and Chartres testified against Hugh.
Meanwhile, with the consent of the Abbey of Saint-Denis, he had a fortress built at Toury, close to Le Puiset, administered by his secretary Suger.
Shortly afterwards, his maternal uncle, Eudes, Count of Corbeil died, naming Hugh as his sole heir.
Warned, the King, who was not far from Paris, returned promptly and defeated the soldiers of Hugh under the walls of Toury.