 The King gave him discretionary powers to negotiate a separate peace.Hemmed in by French forces led by the Duc de Richelieu, Cumberland agreed to the Convention of Klosterzeven, under which his army was to be disbanded and much of Hanover occupied by French forces, at the "Zeven" Convent on 8 September 1757.On Cumberland's return to London, he was treated badly by his father, despite the fact that he had previously been given permission to negotiate such an agreement.