Recovery of part of Rioja, Lava and Gipuzkoa, 1367-1368. In a compromise with both contenders, Charles was forced to choose: in January 1367 the Black Prince asked to pass through Navarre. By tacit agreement of the monarch, the Duke of Lancaster, the Constable of Aquitaine and his lords, Chaudros, the Prince of Wales, King Pedro I, etc., passed with their respective troops, defeating the Trastamara at Njera on 3 April of that year. Charles II saw the time had come to fulfil an old aspiration: the reconquest of the lands of the kingdom previously annexed by Castile. Taking advantage of the struggle (1368) Castilians, he recovered Logroño -where Arnaud Lupo, lord of Luxe, was the first to plant the banner of Navarre-: Vitoria, Salvatierra de la Lava, Contrasta, Rentera and Villafranca de Ordizia. In order to meet the expenses incurred by the reconquest he was forced to sell property in Sang esa, Pamplona, Laguardia, Cintru nigo, Lizoain, Agoncillo, Lazagorr a, Bierlas, Estella, Torralba, Viana, Aguilar, Espronceda, Los Arcos, etc.:
to pay for the retention of the armed men, which we had to have in order to collect the lands of Lava and others that formerly belonged to the crown of the kingdom of Navarre... which we conquered again, and to pay the residents of Viana 2,500 florins which were the value of the provisions that the king's officers took from them for his own expenses, when he had his royal possessions in front of him.