His followers lost heart.

He became a fugitive, and died on the 20th of September, 1415, in the sixty-first year of his age, at the house of one of his married daughters, whether at Scudamore or Mornington is unknown.
Mortimer died in Harlech Castle, during the time it was besieged by the English.

It is said that his death was caused by depression and grief at the misfortunes that had befallen him.
The Earl of Northumberland, as John Forster had anticipated, raised the standard of revolt in 1405, in concert with the Archbishop of York and some other nobles; but before he could join these with his forces, they had been forced to surrender to the king, who had marched north with a great army.

The archbishop and some of his associates were executed, and the earl, finding himself unable to oppose so great a force, fled into Scotland.

Alnwick surrendered without resistance, and Warkworth after a siege of eight days.