In April 1318,
Berwick-upon-Tweed, the last Scottish stronghold which was in the hands of the English, was captured by
Sir James Douglas and
Thomas Randolph,
Earl of Moray, two of King
Robert Bruce's most able commanders. Ever since his defeat at
Bannockburn in 1314,
Edward II had been preoccupied by an ongoing political struggle with his senior barons, headed by
Thomas, Earl of Lancaster. Repeated Scottish raids deep into the north of England had effectively been ignored: but the loss of Berwick was something different. Once the most important port in Scotland, it had been in English hands since 1296; during which time its defences had been greatly strengthened. News of its capture had a sobering effect on Edward and his magnates.
Aymer de Valence, Earl of Pembroke, managed to arrange a temporary reconciliation between the king and Lancaster. In a spirit of artificial harmony, they came north together with a sizeable army in the summer of 1319.
Queen Isabella accompanied the king as far as
York, where she took up residence. Vigorous assaults were made on Berwick by land and sea, but
Walter, the High Stewart of Scotland, ably assisted by John Crabb, a military engineer, conducted an effective defence, beating back all attacks. However, he could not be expected to hold out indefinitely. King Robert had no intention of risking a direct attack on the powerful English army which, in the words of John Barbour, 'might well turn to folly'. Instead, Douglas and Moray were ordered on yet another large-scale diversionary raid into Yorkshire, intended to draw off the besiegers. They came with a large force of mounted infantry, known as
hobelars. ==The Chapter of Myton==