Las Casas was also busy writing a book,--which, however, was never published,--in which he tried to show that the only way to convert men was to convince the mind by reasoning and win the heart by gentleness. The authorities of the province laughed at him and challenged him to try it, by declaring that if he succeeded in subduing any tribe by these methods, they would at once set free their slaves. Las Casas boldly took up the challenge and selected for the trial a part of the country called "The Land of War."[1] Alvarado had carried on a terrible war in Guatemala. Thousands of Indians had been killed, tortured, and made slaves. The people of the district where Las Casas intended to try his experiment were a hardy, warlike race, and their country was a land of steep mountains, deep ravines, and many furious mountain torrents. They had fought desperately for their liberty. Three times the Spaniards had attempted to conquer them, and each time had been driven back. They were a terror to the white men, and not a Spaniard dared to go near them. It was rightly named The Land of War. Yet it was these turbulent, unconquerable people whom Las Casas now declared he would Christianize and make subject to Spanish rule. He would take no soldiers with him and would accept no aid of any kind. All that he asked was that when his work should be accomplished, they might be left free, only paying tribute, as all subjects did, to the crown. To this the governor of Guatemala agreed. By this time the fathers could both write and speak the Quichi language well, and they went to work to compose in verse an account of the creation, the fall of man, the birth, life, and miracles of our Lord, and His death upon the cross. These verses they set to music, for the Indians were fond of songs. There were certain Christian Indians that traded with the people in the Land of War, going to them at regular intervals. The fathers chose some of these traders and taught them the songs. They learned very quickly, and also played an accompaniment on their musical instruments. When they were ready they started, with an assortment of all kinds of articles such as the Indians particularly liked,--knives, scissors, little looking-glasses, and so on. As they had been instructed, the four peddlers went first to a great native prince. His people all came flocking to buy, and when the business of the day was over, they took pains to win his favor by making him a present. After supper they took out their musical instruments and began to play and chant the verses they had learned. Hundreds of dusky warriors, attracted by the sweet strains, sat about in the moonlight and listened. Next night many more natives came, and when the song was ended, the chief asked to have it explained. This was just the opportunity the traders had been waiting for. They told the chief that they sang only what they had heard, and that only the _padres_ could explain the verses.