After the Anti-Christ Amalickiah obtains power over the Lamanites by fraud and deceit he soon afterwards initiates a propaganda campaign. Moroni, on the other hand starts to prepare the minds his people to be “faithful unto the Lord their God.” Here is how it is written:
And now it came to pass that, as soon as Amalickiah had obtained the kingdom he began to inspire the hearts of the Lamanites against the people of Nephi; yea, he did appoint men to speak unto the Lamanites from their towers, against the Nephites.
Now it came to pass that while Amalickiah had thus been obtaining power by fraud and deceit, Moroni, on the other hand, had been preparing the minds of the people to be faithful unto the Lord their God.
Source: Alma 48:1, 7; The Book of Mormon: Another Testament of Jesus Christ