William divided his army into three columns and one of these, under the command of Duncan, Earl of Fife, attacked Warkworth and set fire to the church of St Lawrence with a large number of refugees inside.
On the night of 11 July, a party of about four hundred mounted knights, led by Ranulf de Glanvill, set out from Newcastle and headed towards Alnwick.
[1] Whilst he was there, Henry sent an army to occupy part of Scotland, with its five strongest castles: Roxburgh, Berwick, Jedburgh, Edinburgh, and Stirling.
When William was released, after signing the treaty, he travelled back to Scotland via Newcastle, and was attacked by a mob; such was the antipathy of the local people towards Scottish invaders.
The Treaty of Falaise lasted for fifteen years until Richard the Lionheart effectively sold the castle back to William in order to fund his crusade to the Holy Land.
In 1237, under the Treaty of York, Alexander II of Scotland abandoned his forefathers’ claims to Northumbria and Cumbria, and set the boundary between the two kingdoms as running between the Solway Firth (in the west), and the mouth of the River Tweed (in the east), although in the east, it now leaves the River Tweed to swing around Berwick, which finally became an English town in 1482 after centuries of changing hands Treaty of Fotheringhay.