How does Luis Cervantes change over the course of the book, The Underdogs a Novel of the Mexican Revolution?

Luis Cervantes, a former journalist and medical student once wrote essays against the rebels, and in his fervor, he joined the Federal army. Luis did not find the regimented lifestyle to his liking, however, and he developed a hatred and suspicion of his superiors, to the point that he gradually came to believe in the rebels rather than the Federals.

Luis, in his status as an intellectual familiar with the social, political, and philosophical underpinnings of the Revolution, provides a kind of commentary on the action, grounding the actions of Demetrio's band (who have no broader perspective) into the larger context of the Mexican Revolution. At first with Luis there is a degree of disillusionment - he expects to find noble and professional patriots and instead finds starving murderers and looters dressed in rags. The possibility of deep disillusionment is voiced by the character of Solis, but by Part II, Luis is firmly entrenched with Demetrio's band, abandoning any intellectual misgivings for the instantaneous pleasures of being a rebel in the company of a famous general. It is here, drunk in the moment, that Luis displays characteristics consistent with the rest of the band, hoarding goals and jewels. However, he is able to imagine a time in the future after the revolution is over, as demonstrated when he foolishly takes on a "future wife," or when he invites Demetrio to leave the country with him. In Luis, there is a naivete, or at least a lack of love for bloodshed, that allows him to stray from Demetrio's fatal and determined path and leave the band. In the end, he has seemingly abandoned the revolution intellectually, giving up hope for a medical degree in favor of opening up a Mexican restaurant.