 He was preparing to besiege Louis in London when the war was terminated by the naval victory of Hubert de Burgh in the straits of Dover.William was criticized for the generosity of the terms he accorded to Louis and the rebels in September 1217, but his desire for an expedient settlement was dictated by sound statesmanship.Self-restraint and compromise were the keynotes of Marshal's policy, hoping to secure peace and stability for his young liege.