the sources. Military training and strategy are two important matters on which the sources are typically silent. There are no references in literature or laws to men training, and so it is necessary to fall back on inference. For the noble warrior, his childhood was of first importance in learning both individual military skills and the teamwork essential for success in battle. Perhaps the games the youthful Cuthbert played ('wrestling, jumping, running, and every other exercise') had some military significance. Turning to strategy, of the period before Alfred the evidence gives the impression that Anglo-Saxon armies fought battles frequently. Battle was risky and best avoided unless all the factors were on your side. But if you were in a position so advantageous that you were willing to take the chance, it is likely that your enemy would be in such a weak position that he would avoid battle and pay tribute. Battles put the princes' lives at risk, as is demonstrated by the Northumbrian and Mercian overlordships brought to an end by a defeat in the field. Gillingham has shown how few pitched battles Charlemagne and Richard I chose to fight. A defensive strategy becomes more apparent in the later part of Alfred's reign. It was built around the possession of fortified places and the close pursuit of the Danes to harass them and impede their preferred occupation of plundering. Alfred and his lieutenants were able to fight the Danes to a standstill by their repeated ability to pursue and closely besiege them in fortified camps throughout the country. The fortification of sites at Witham, Buckingham, Towcester and Colchester persuaded the Danes of the surrounding regions to submit. The key to this warfare was sieges and the control of fortified places. It is clear that the new fortresses had permanent garrisons, and that they were supported by the inhabitants of the existing burhs when danger threatened. This is brought out most clearly in the description of the campaigns of 917 in the Chronicle, but throughout the conquest of the Danelaw by Edward and Æthelflæd it is clear that a sophisticated and coordinated strategy was being applied. In 973, a single currency was introduced into England in order to bring about political unification, but by concentrating bullion production at many coastal mints, the new rulers of England created an obvious target which attracted a new wave of Viking invasions, which came