produced few results; the only major military victory in this phase of the war was the English naval victory at Sluys on 24 June 1340, which secured its control of the English Channel. Cost of war Meanwhile, the fiscal pressure on the kingdom caused by Edward's expensive alliances led to discontent at home. The regency council at home was frustrated by the mounting national debt, while the king and his commanders on the Continent were angered by the failure of the government in England to provide sufficient funds. To deal with the situation, Edward himself returned to England, arriving in London unannounced on 30 November 1340. Finding the affairs of the realm in disorder, he purged the royal administration of a great number of ministers and judges. These measures did not bring domestic stability, and a stand-off ensued between the king and John de Stratford, Archbishop of Canterbury, during which Stratford's relatives Robert Stratford, Bishop of Chichester, and Henry de Stratford were temporarily stripped of title and imprisoned respectively. Stratford claimed that Edward had violated the laws of the land by arresting royal officers. A certain level of conciliation was reached at the parliament of April 1341. Here Edward was forced to accept severe limitations to his financial and administrative freedom, in return for a grant of taxation. Yet in October the same year, the king repudiated this statute and Archbishop Stratford was politically ostracised. The extraordinary circumstances of the April parliament had forced the king into submission, but under normal circumstances the powers of the king in medieval England were virtually unlimited, a fact that Edward was able to exploit. Historian Nicholas Rodger called EdwardIII's claim to be the "Sovereign of the Seas" into question, arguing there was hardly any royal navy before the reign of HenryV (1413–1422). Despite Rodger's view, King John had already developed a royal fleet of galleys and had attempted to establish an administration for these ships and others which were arrested (privately owned ships pulled into royal/national service). HenryIII, his successor, continued this work. Notwithstanding the fact that he, along with his predecessor, had hoped to develop a strong and efficient naval administration, their endeavours produced one that was informal and mostly ad hoc. A formal naval administration emerged during Edward's reign, comprising lay administrators and led by William de Clewre, Matthew de Torksey and John de Haytfield successively bearing the title of Clerk