The Catholic Encyclopedia has biography of Las Casas at .
This readingis from de las Casas' version.
Before finishing his initial studies, at the age of eighteen, he embarked on his first trip to the Americas, traveling to the Island of Hispaniola. It appears that he received minor orders and the tonsure in Seville shortly before leaving for the Indies on February 13, 1502. He arrived on April 15, 1502, in Santo Domingo, the place where he lived and labored for the next five years before again returning to Spain. While working holdings of lands and Indians, his own and those of his merchant father, he also traveled the island as a provisioner to the Spanish soldiery. During this early period, while accompanying two different military expeditions of Governor Ovando, he observed the tragic massacre of a large group of Indian leaders on the island. The young Las Casas deplored all the killings and was horrified by what he witnessed of these atrocities. Moreover, while traveling as a provisioner he also began to see first-hand the conditions to which the Indians were being subjected and the disruption of native life caused by the Spanish enslavement of the indigenous to mine for gold.
In his last will and testament Las Casas described his callas:
With Las Casas we may remember Bartolomeo de Olmedo, priest and friar of Mercy, who was chaplain of Cortez's expedition to Mexico City, and who appears in the records of that expedition as a moderating force, denouncing atrocities and conquest, talking Cortez out of forcibly destroying idol temples, telling him instead to set the Indians an example of Christian love, and wait for them to destroy the idols by their own decision. (Some readers will remember him from Samuel Shellabarger's historical novel, Captain From Castille.) According to the Britannica article on pre-Columbian American cultures (see vol. 26 p. 25 of the 15th edition), the clergy accompanying the Spanish conquistadors were consistently more disposed than the commanders to respect the native civilizations and undertake to preserve their records, and whatever aspects of native culture were not clearly inconsistent with Christianity.