Gradually the greater part of England acknowledged the rule of Alfred. The kingdom of Kent was again united to that of Wessex; while Mercia, which extended across the centre of England from Anglia to Wales, was governed for Alfred by Ethelred the Ealdorman, who was the head of the powerful family of the Hwiccas, and had received the hand of Alfred's daughter Ethelfleda. He ruled Mercia according to its own laws and customs, which differed materially from those of the West Saxons, and which prevented a more perfect union of the two kingdoms until William the Conqueror welded the whole country into a single whole. But Ethelred acknowledged the supremacy of Alfred, consulted him upon all occasions of importance, and issued all his edicts and orders in the king's name. He was ably assisted by Werfrith, the Bishop of Worcester. The energy and activity of these leaders enabled Mercia to keep abreast of Wessex in the onward progress which Alfred laboured so indefatigably to promote. Edmund, when not occupied with the affairs of his earldom, spent much of his time with the king, who saw in him a spirit of intelligence and activity which resembled his own. Edmund was, however, of a less studious disposition than his royal master; and though he so far improved his education as to be able to read and write well, Alfred could not persuade him to undertake the study of Latin, being, as he said, well content to master some of the learning of that people by means of the king's translations. At the end of another two years of peace Edmund was again called upon to take up arms. Although the Danes attempted no fresh invasion some of their ships hung around the English coast, capturing vessels, interfering with trade, and committing other acts of piracy. Great complaints were made by the inhabitants of the seaports to Alfred. The king at once begged Edmund to fit out the Dragon, and collecting a few other smaller ships he took his place on Edmund's ship and sailed in search of the Danes. After some search they came upon the four large ships of the Northmen which had been a scourge to the coast. The Saxons at once engaged them, and a desperate fight took place. The Dragon was laid alongside the largest of the Danish vessels; and the king, with Edmund and Egbert by his side, leapt on to the deck of the Danish vessel, followed by the crew of the Dragon. The Danish ship was crowded with men who fought desperately, but the discipline even more than the courage of Edmund's crew secured for them the victory. For a time each fought for himself; and although inspired by the presence of the king they were able to gain no advantage, being much out-numbered by the Northmen.