Helaman 11:28

And it came to pass that it was expedient that there should be a stop put to this work of destruction; therefore they sent an army of strong men into the wilderness, and upon the mountains, to search out this band of robbers, and to destroy them.

This destruction had to be stopped. So they sent a strong army into the wild places and mountains. The army was supposed to find these robbers and destroy them.

Something had to be done to stop this destruction. So they sent a strong army into the wilderness and mountains to hunt down the robber gang and destroy them.