In September, 1540, seventy or eighty of the weakest and least reliable men in Coronado’s army remained at the town of San Hieronimo, in the valley of Corazones or Hearts. Melchior Diaz was placed in command of the settlement, with orders to maintain this post and protect the road between Cibola and New Spain, and also to attempt to find some means of communicating with the fleet under Alarcon. After he had established everything in the town as satisfactorily as possible, Diaz selected twenty-five of these men to accompany him on an exploring expedition to the seacoast. He started before the end of September, going into the rough country west of Corazones valley, and finding only a few naked, weak-spirited Indians, who had come, as he understood, from the land on the farther side of the water, i. e., Lower [p407] California. He hurried across this region and descended the mountains on the west, where he encountered the Indian giants, some of whom the army had already seen. Turning toward the north, or northwest, he proceeded to the seacoast, and spent several days among Indians who fed him with the corn which they raised and with fish. He traveled slowly up the coast until he reached the mouth of a river which was large enough for vessels to enter. The country was cold, and the Spaniards observed that when the natives hereabouts wished to keep warm, they took a burning stick and held it to their abdomens and shoulders. This curious habit led the Spaniards to name the river Firebrand—Rio del Tizon. Near the mouth of the river was a tree on which was written, “A letter is at the foot of this.” Diaz dug down and found a jar wrapped so carefully that it was not even moist. The inclosed papers stated that “Francisco de Alarcon reached this place in the year ’40 with three ships, having been sent in search of Francisco Vazquez Coronado by the viceroy, D. Antonio de Mendoza; and after crossing the bar at the mouth of the river and waiting many days without obtaining any news, he was obliged to depart, because the ships were being eaten by worms,” the terrible _Teredo navalis_.[88]