But some of the caciques doubted the feasibility of the plan. Had not the fugitives from Quisqueiá[16] told of the terrible effects of the shining blades they wore by their sides when wielded in battle by the brawny arms of the dreaded strangers? Did not their own arrows glance harmlessly from the glittering scales with which they covered their bodies? Was Guaybána quite sure that the white-faced invader could be killed at all? The majority thought that before undertaking their extermination they ought to be sure that they had to do with a mortal enemy. Oviedo and Herrera both relate how they proceeded to discover this. Urayoán, the cacique of Yagüeca, was charged with the experiment. Chance soon favored him. A young man named Salcedo passed through his village to join some friends. He was hospitably received, well fed, and a number of men[17] were told to accompany him and carry his luggage. He arrived at the Guaorába, a river on the west side of the island, which flows into the bay of San German. They offered to carry him across. The youth accepted, was taken up between two of the strongest Indians, who, arriving in the middle of the river, dumped him under water--then they fell on him and held him down till he struggled no more. Dragging him ashore, they now begged his pardon, saying that they had stumbled, and called upon him to rise and continue the voyage; but the young man did not move, he was dead, and they had the proof that the supposed demi-gods were mortals after all. The news spread like wildfire, and from that day the Indians were in open rebellion and began to take the offensive, shooting their arrows and otherwise molesting every Spaniard they happened to meet alone or off his guard. The following episode related by Oviedo illustrates the mental disposition of the natives of Boriquén at this period.