Alma 18:6-7

6 For he had slain many of them because their brethren had scattered their flocks at the place of water; and thus, because they had had their flocks scattered they were slain.

7 Now it was the practice of these Lamanites to stand by the waters of Sebus to scatter the flocks of the people, that thereby they might drive away many that were scattered unto their own land, it being a practice of plunder among them.

Those naughty Lamanites are also on the list of future conversions.