At the close of 1407 the murder of the Duke of Orleans by the order of the Duke of Burgundy changed the weak and fitful strife which had been going on into a struggle of the bitterest hate.

The Count of Armagnac placed himself at the head of the murdered duke's partizans; and in their furious antagonism Armagnac and Burgundian alike sought aid from the English king.
[Sidenote: Prince Henry] But the fortune which favoured Henry elsewhere was still slow to turn in the West.

In the opening of 1405 the king's son, Henry Prince of Wales, had taken the field against Glyndwr.

Young as he was, Henry was already a tried soldier.

As a boy of thirteen he had headed an incursion into Scotland in the year of his father's accession to the throne.