There is a temporary reprieve because the Nephites were able to be somewhat successful. The Nephites had been driven far enough north that they were now in the lands northward. Although Mormon does not reiterate it here, these are the lands that he had named Desolation, and were called Desolation because they were the lands where the Jaredites had met their end.
The treaty divides the land at the narrow neck. The Nephites lost the land southward which had been their homeland for about six hundred years by this time. They were now no longer in the land of their inheritance, but in the land of destruction, the land Desolation.
It is important to note that once again Mormon emphasizes that the robbers of Gadianton are among the Lamanites, and that they were one of the parties to the treaty.
This is the end of the chapter in the 1830 Book of Mormon.