to bring Don Pedro. Felton's expedition landed at Bayonne, where Don Pedro had already arrived, and returned with him and his suite to Bordeaux. Campaigns in Spain and Poitou The invasion of Spain having been agreed upon, Felton and Chandos obtained leave from the King Charles II of Navarre to cross the mountain passes into Spain. Felton in March 1367 preceded the prince with an advance force of 200 men-at-arms and archers, and found the enemy encamped near Navarrete. They were attacked by a large body of Spaniards, and all were either killed or taken prisoner in a battle at Aríñez. Sir William de Felton, Thomas's kinsman and Seneschal of Poitou, was among the slain. Thomas was taken prisoner, and was later exchanged for Arnoul d'Audrehem, Marshal of France, who was captured by the English at the Battle of Nájera (Navarrete) in April 1367. He afterwards took part in combats and sieges at Monsac, at Duravel, and at Domme. The lands and barony of Chaumont in Gascony were given by Edward III to Sir John Chandos (died 1369), with a reversion at his death to Felton. Felton's near kinsman Thomas Walkfare was Seneschal of Quercy and Périgord, and his brother Richard Walkfare Seneschal of Agenois, and also Mayor of Bordeaux 1366–69. Felton was recalled to Angoulême by the prince, and sent into Poitou with John Hastings, Earl of Pembroke. He secured La Linde on the Dordogne when it was about to be betrayed to the French. He joined John of Gaunt, Duke of Lancaster in an attack on the town of Mont-Paon, and made an unsuccessful attempt to relieve the garrison of Thouars. In spite of his efforts Monsac was lost to the English. In 1372, when the Black Prince had surrendered the principality of Aquitaine into the king's hands, it was granted by royal commission to Felton and Sir Robert Wykford. Upon the final withdrawal of the Duke of Lancaster, Felton was appointed Seneschal of Bordeaux. Capture and ransom, 1377–1380 In February 1375 he returned to England. A year later he received orders to put the truce into effect, and, in December 1376, to negotiate with the King of Navarre. He caused Guillem-Sanche IV de Pommiers, Vicomte de Fronsac (heir of the ancient rulers of Gascony), and his confessor Coulon, to be beheaded at Bordeaux for treason. These events coincided with the close of the reign of Edward III.