Is Diaz's report reliable? Before the 15th century, the Indians of the Americas were unconnected to the world and would remain so until Columbus' exploration. In the early 15th century, the Aztecs were the dominant group in Mesoamerica led by Montezuma, the last leader, before the Spanish conquest. In 1519, Hernan Cortez led the Spanish mission to explore and conquer the New World. This article will compare three primary sources on this event. First, an informative letter sent by Cortez to King Charles V, King of Spain. Secondly, the Broken Lances, which is an Indian reminder of the conquest of Mexico. Finally, the story of Bernal Diaz (one of Cortez's men) was written by him to share his experience with the Aztec civilization. Furthermore, this article will show the credibility of Diaz's account compared to other sources thanks to the objectivity of its tone, written after some time after the event, and the author's great experience and his source-independent purpose. Diaz's story is more credible because of the objective tone of his story compared to the others. This was evident when he described events in great detail without his emotions. Although it is difficult to recognize his opinion on the event. For example, when he said "he put it around the neck of the Great Montezuma and when he had put it like that he was about to embrace him, and those great Princes who accompanied Montezuma held Cortés by the arm so that he would not embrace him, because they considered it a humiliation" (Diaz , p. 2). On the other hand, the embellishment of Cortez's letter makes the explanation of the event subjective in some parts. According to Cortez, he attacked two villages before dawn, but he... in the middle of the paper. .. time means he was educated. In contrast, Cortez was a captain who had a mission to fulfill. Furthermore, he sent his letter to inform the king of the event, his successes and the championship to justify his position with the. Spanish rulers. However, The Broken Spears is a remembrance of the Spanish by unidentified Indians to show their fateful conflict. In summary, since Diaz wrote his book to tell the reading public about his experience with the events, it is more reliable. In conclusion, this article has demonstrated that Diaz's is more credible than the others for three reasons. First of all, the objectivity of the tone he used, making it difficult to recognize his point of view. Secondly, he wrote it after some time after the event, so he didn't take care of his group in writing. Ultimately, he wrote it to inform the public about his experience with the Aztecs.