No battles are recorded between the Anglo-Saxons and the Danish Vikings for several years after the
Battle of the Holme, but in 906, Edward agreed to peace with the East Anglian and Northumbrian Danes, suggesting that there had been conflict. According to one version of the
Anglo-Saxon Chronicle he made peace "of necessity", which implies that he was forced to buy them off. He encouraged Englishmen to purchase land in Danish territory, and two charters survive relating to estates in
Bedfordshire and
Derbyshire. In 909, Edward sent a combined West Saxon and Mercian army which harassed the Northumbrian Danes, and seized the bones of the Northumbrian royal saint
Oswald from
Bardney Abbey in
Lincolnshire. Oswald was
translated to
a new Mercian minster established by Æthelred and Æthelflæd in
Gloucester and the Danes were compelled to accept peace on Edward's terms. In the following year, the Northumbrian Danes retaliated by raiding Mercia, but on their way home they were met by a combined Mercian and West Saxon army at the
Battle of Tettenhall, where the Vikings suffered a disastrous defeat. After that, the Northumbrian Danes did not venture south of the River
Humber during Edward's reign, and he and his Mercian allies were able to concentrate on conquering the southern Danelaw in East Anglia and the
Five Boroughs of Viking east Mercia:
Derby,
Leicester,
Lincoln,
Nottingham and
Stamford. In 911, Æthelred, Lord of the Mercians, died, and Edward took control of the Mercian lands around London and
Oxford. Æthelred was succeeded as ruler by his widow Æthelflæd (Edward's sister) as Lady of the Mercians, and she had probably been acting as ruler for several years as Æthelred seems to have been incapacitated in later life. Edward and Æthelflæd then began the construction of fortresses to guard against Viking attacks and protect territory captured from them. In November 911, he constructed a fort on the north bank of the
River Lea at
Hertford to guard against attack by the Danes of
Bedford and
Cambridge. In 912, he marched with his army to
Maldon, Essex, and ordered the building of a fort at
Witham and a second fort at Hertford, which protected London from attack and encouraged many English living under Danish rule in Essex to submit to him. In 913, there was a pause in his activities, although Æthelflæd continued her fortress building in Mercia. In 914, a Viking army sailed from
Brittany and ravaged the
Severn estuary. It then attacked
Ergyng in south-east Wales (now
Archenfield in
Herefordshire) and captured
Cyfeilliog, Bishop of Ergyng. Edward ransomed him for the large sum of forty pounds of silver. The Vikings were defeated by the armies of Hereford and Gloucester, and gave hostages and oaths to keep the peace. Edward kept an army on the south side of the estuary in case the Vikings broke their promises, and he twice had to repel attacks. In the autumn the Vikings moved on to Ireland. The episode suggests that south-east Wales fell within the West Saxon sphere of power, unlike
Brycheiniog just to the north, where Mercia was dominant. In late 914 Edward built two forts at
Buckingham, and Earl Thurketil, the leader of the Danish army at Bedford submitted to him. The following year Edward occupied Bedford, and constructed another fortification on the south bank of the
River Great Ouse against a Viking one on the north bank. In 916, he returned to Essex and built a fort at Maldon to bolster the defence of Witham. He also helped Earl Thurketil and his followers to leave England, reducing the number of Viking armies in the Midlands. The decisive year in the war was 917. In April, Edward built a fort at
Towcester in
Northamptonshire as a defence against the Danes of
Northampton, and another at an unidentified place called Wigingamere. The Danes launched unsuccessful attacks on Towcester, Bedford and Wigingamere, while Æthelflæd captured Derby, showing the value of the English defensive measures, which were aided by disunity and a lack of coordination among the Viking armies. The Danes had built their own fortress at
Tempsford in Bedfordshire, but at the end of the summer the English stormed it and killed the last Danish king of East Anglia. The English then took
Colchester, although they did not try to hold it. The Danes retaliated by sending a large army to lay siege to Maldon, but the garrison held out until it was relieved and the retreating army was heavily defeated. Edward then returned to Towcester and reinforced its fort with a stone wall, and the Danes of nearby Northampton submitted to him. The armies of Cambridge and East Anglia also submitted, and by the end of the year the only Danish armies still holding out were those of four of the Five Boroughs, Leicester, Stamford, Nottingham, and Lincoln. In early 918, Æthelflæd secured the submission of Leicester without a fight, and the Danes of Northumbrian York offered her their allegiance, probably for protection against
Norse (Norwegian) Vikings who had invaded Northumbria from Ireland, but she died on 12 June before she could take up the proposal. The same offer is not known to have been made to Edward, and the Norse Vikings took York in 919. According to the main West Saxon version of the
Anglo-Saxon Chronicle, after Æthelflæd's death the Mercians submitted to Edward, but the Mercian version (the
Mercian Register) states that in December 918 her daughter Ælfwynn "was deprived of all authority in Mercia and taken into Wessex". Mercia may have made a bid for continued semi-independence which was suppressed by Edward, and it then came under his direct rule. Stamford had surrendered to Edward before Æthelflæd's death, and Nottingham did the same shortly afterwards. According to the
Anglo-Saxon Chronicle for 918, "All the people who had settled in Mercia, both Danish and English, submitted to him." This would mean that he ruled all England south of the Humber, but it is not clear whether Lincoln was an exception, as coins of Viking York in the early 920s were probably minted at Lincoln. Some Danish
jarls were allowed to keep their estates, although Edward probably also rewarded his supporters with land, and some he kept in his own hands. Coin evidence suggests that his authority was stronger in the East Midlands than in East Anglia. Three Welsh kings,
Hywel Dda, Clydog and
Idwal Foel, who had previously been subject to Æthelflæd, now gave their allegiance to Edward. == Coinage ==