There was one case however in which its punitive clauses seem to have been invoked. Several of the accomplices in the assassination found refuge in Tudela, a frontier city of Navarre and on January 27, 1486, Ferdinand wrote to the magistrates there affectionately requesting that, if the inquisitors should send for the accused, all aid should be rendered, seeing that he had given orders to obey such requisitions throughout his own kingdoms. This application was unsuccessful and in May he repeated it imperiously, threatening war upon them as defenders of heretics.[660] The condition of the perishing kingdom of Navarre, under the youthful Catherine and Jean d'Albret, was not such as to protect it from the insults of a sovereign like Ferdinand and the inquisitors presumed so far as to instruct Don Juan de Ribera, then in command of the frontier, to carry the royal threats into execution. That prudent officer refused to make war upon a friendly state without the protection of an express order bearing the signatures of Ferdinand and Isabella, whereupon, on June 30th, the inquisitors complained of him to the king. He was in Galicia, suppressing a rising of the Count of Lemos and reducing the lawless nobles to order and from Viso, July 22d, he replied that he would at once have sent the order but that he had brought with him all the frontier troops; as soon as his task was accomplished he would send back forces with orders to Don Juan to make war on Tudela in such fashion as to compel it to do what was requisite for the service of God.[661] A letter of the same date to Torquemada states that the inquisitors have asked for letters of marque and reprisal against Tudela on account of Luis de Santangel, but this must be preceded by a _carta requisitoria_, which he instructs Torquemada to prepare and send to him when he will execute it.[662] It was not until the end of November that the sovereigns returned to Salamanca and it is presumable that the campaign against Tudela was postponed until the Spring. Of course the fugitives had long before sought some safer asylum, but the papal brief of April 3, 1487, could be enforced against the magistrates and they endured the humiliation of submitting to the tribunal of Saragossa. At an auto de fe held March 2, 1488, the alcalde and eight of the citizens appeared and performed penance.[663]