In spite of the agreement which the English had made with the King of Navarre, they were still afraid of him, for they heard that he had again begun to treat with Henry of Trastamare. The Black Prince ordered two of the frontier towns of Navarre to be invested with English troops, and compelled the King of Navarre to accompany the army until it had safely passed through his dominions. They crossed the Pyrenees by the pass of Roncesvalles. The passage through these narrow defiles was most dangerous and difficult, as it was now the middle of winter. The entire army was almost overwhelmed by a frightful snow-storm, which overtook them in the mountains. They suffered great loss both in men and beasts, but at last reached the valley of Pampeluna, where they stopped to recruit their forces. Whilst they were waiting there, the King of Navarre, as he was riding about, was taken prisoner by a French captain. He was supposed to have purposely allowed this to happen, that he might be freed from all further personal responsibility as to the war. One of his knights however conducted the Prince through the kingdom of Navarre, and provided guides for the army through the difficult mountain roads. The army crossed the deep and rapid Ebro by the bridge at Logrono, and encamped near the little town of Navarette. Don Henry and Du Guesclin were not far off, encamped near Najera on the little river Najerilla. From Navarette the Black Prince sent his manifesto to Don Henry. In this he stated that he had come to restore the legitimate king to his throne, and expressed his amazement that Henry, who had sworn allegiance to his brother, should have ventured afterwards to take up arms against him, and drive him from his rightful throne. He called God and St. George to witness that he was willing even now to settle the dispute by mediation; but if that were refused, there was nothing left for it but to fight. Henry answered on the following day. He said that the whole kingdom had fallen away from Don Pedro, and attached themselves to him; that it was heaven's doing, and no one had a right to interfere. He also, in God's name and St. Iago's, had no desire for a battle; but he forbade the enemy to press any further into his country. On their march to Logrono, the Prince's army had suffered much from want of provisions; he was therefore eager for a battle as soon as possible; but the enemy waited to attack till all their troops should have arrived. Sir William Felton went with a body of men to reconnoitre the enemy, but was attacked by a large number of French and Spaniards, and was slain, after a most valiant fight. Sir Hugh Calverly, another of the bravest English knights, was also surprised and slain by a large body of Spaniards, who had gone out under Don Tello, Henry's brother, to reconnoitre the English army.