His call to arms robbed Henry of the aid of those English Companies who had marched till now with the rest of the crusaders, but who returned at once to the standard of the Prince; the passes of Navarre were opened with gold, and in the beginning of 1367 the English army crossed the Pyrenees.

Advancing to the Ebro the Prince offered battle at Navarete with an army already reduced by famine and disease in its terrible winter march, and Henry with double his numbers at once attacked him.

But in spite of the obstinate courage of the Castilian troops the discipline and skill of the English soldiers once more turned the wavering day into a victory.

Du Guesclin was taken, Henry fled across the Pyrenees, and Pedro was again seated on his throne.

The pay however which he had promised was delayed; and the Prince, whose army had been thinned by disease to a fifth of its numbers and whose strength never recovered from the hardships of this campaign, fell back sick and beggared to Aquitaine.