Alma 63:14

And it came to pass also in this year, that there were some dissenters which had gone forth unto the Lamanites; and they were stirred up again to anger against the Nephites.

That same year, some people left the Nephites and joined the Lamanites. They made the Lamanites angry at the Nephites again.

Also that year, some Nephite rebels went over to the Lamanites and stirred up anger against the Nephites again.