The situation changed again, in 1306, when de Brus murdered his rival John Comyn and had himself crowned King of Scotland by Isobel, sister of the Earl of Buchan. Edward, in ill health, sent armies north under other commanders. Brus was beaten at the Battle of Methven in June 1306. After the battle, Edward followed with brutal suppression of the allies of de Brus. In response this fueled more rebellions. This conflict was still in progress in 1307 when Edward, now an elderly man, led his final campaign into Scotland before dying at the border city of Burgh-by-sands at age 68, leading to the succession of the Prince of Wales as Edward II of England.