Reginald was no sooner on the throne, than he armed against his uncle, who was also preparing to dispossess him. The quarrel between these two kings incited Edmund to march towards the north at the head of an army, to appease the troubles there, being apprehensive they might give occasion to the foreign Danes to return into England. He arrived upon the borders of Northumbria, when the uncle and nephew, wholly intent upon their private quarrel, thought of nothing less than repulsing the English. He probably might with ease have made himself master of that kingdom; but he was contented with procuring peace between the two kings, in such a manner that Reginald was to keep the crown he had lately received; but at the same time, Edmund obliged them both to swear allegiance to him, and be baptised, himself standing godfather. This forced peace did not last long, and Edmund had hardly returned into Wessex, when the two Danish princes took up arms to free themselves from his yoke, having engaged the Mercian Danes and the King of Cumberland to espouse their quarrel. Whereupon Edmund immediately marched into Mercia, and before the Danes there could be joined by the Northumbrians, took from them the five boroughs, _i.e._ Leicester, Stamford, Derby, Nottingham, and Lincoln; and then, advancing with the same expedition towards Northumbria, he surprised the two kings before they had drawn their forces together. This sudden attack threw the Northumbrians into such disorder, that their rulers, fearing to fall into the hands of Edmund, believed it their only refuge to abandon the island, where they could not possibly remain in safety, so closely were they pursued; and as their flight deprived the Danes of all hope of withstanding Edmund, they threw down their arms, and gave him allegiance. According to other accounts, the attack upon the Mercian Danes is placed earlier in the reign. Before he returned to Wessex, Edmund resolved to punish the King of Cumberland, who, without cause, had taken part with the Danes; and he easily subdued that petty kingdom, whose forces bore no proportion to his own, and presented it to the King of Scotland, in order to attach him to his interest, and prevent him from again assisting the Northumbrians; reserving, however, the sovereignty of it, and obliging that king to do him homage, and appear at the court of England at the time of the solemn festivals, if summoned. Edmund was not wholly employed in military affairs; and some of his laws still exist which demonstrate how desirous he was of the people's welfare and happiness. Having observed that pecuniary punishments were not sufficient to put a stop to robberies, which were generally committed by people who had nothing to lose, he ordered that, in gangs of robbers, the oldest of them should be condemned to be hanged.