Yet two important obstacles met Mendoza at the start. In the first place, the unknown country, which the Spaniards vaguely knew by the name of Cibola,[3] could be reached only through mountain defiles, so rugged and inaccessible that men questioned whether it could be reached at all. Nature had admirably adapted it for defence. Clearly, then, a few resolute men might easily defend their country against a host, and the Spaniards having reason to expect the most determined resistance found a twofold hinderance in their way. The second obstacle, the Spaniards had created for themselves, by making slaves of all natives taken in arms. Rather than be slaves the Indians had fled into the mountain fastnesses. As their fear of the Spaniards was very great, these fugitives secreted themselves in the most inaccessible places, choosing rather to live like wild beasts than be branded like cattle with hot irons, and nursing their hatred of their oppressors. Not venturing to come down into the open valleys where they would be at the mercy of their conquerors, these unhappy people lived in caves, or in stone dwellings perched high among the rocks, where they could at least breathe the air of liberty unmolested. Those who formerly lived in the valleys had also fled to the mountains when they heard of the Spaniards' coming. So the Spaniards would have to contend not only with nature, but with a brave and a hostile people, if they attempted to subdue them. [Illustration: NEW MEXICO.—ROUTE OF SPANISH INVADERS.] Considering that great difficulties are often overcome or results accomplished by simple means, the viceroy took a poor barefooted friar[4] from his cell, gave him one of Narvaez' men for a guide, and with a few natives of the country sent him out to explore the unknown wilds. Upon reaching Culiacan, which was the most northerly place the Spaniards had made their way to, the captive Indians were sent ahead with messages of peace and good-will to the distrustful natives, who took good care to keep out of the way. These promises of peace induced a great many of the natives to come down from the mountains; and once there they were easily won over with gifts and kind words, and in gratitude for the promise not to capture and enslave them as they had done, told the Spaniards to go and come as freely as they chose. The natives were then sent home to spread the news among their brethren.