Alma 2:21

And Alma sent spies to follow the remnant of the Amlicites, that he might know of their plans and their plots, whereby he might guard himself against them, that he might preserve his people from being destroyed.

Alma sent spies to follow the rest of the Amlicites. He wanted to know their plans so he could protect his people.

Alma sent out scouts to track what was left of the Amlicites. He needed to know their plans so he could protect his people from destruction.