3 Nephi 3:17

And it came to pass that Lachoneus did appoint Chief Captains over all the armies of the Nephites, to command them at the time that the robbers should come down out of the wilderness against them.

Lachoneus chose chief captains over all the Nephite armies. They would lead when the robbers came down from the wild lands against them.

Lachoneus appointed chief captains over all the Nephite armies to lead them when the robbers came down from the wilderness.