After God has judged and defeated the enemies of Israel, then the spoils that those enemies have left behind will be free for the taking, so to speak.
There have been many examples throughout history, where evil has been defeated, and subsequent to that defeat, the victors gather in the spoils.
This particular defeat of God’s enemies, will occur at the end of human history, at the end of the tribulation, when Christ returns at the second advent.
And at that time, the enemies of Israel, will be located everywhere on the planet, and especially in the Middle East.
The caterpillar and the locust, are used as a comparison, in that they come and go wherever they want and whenever they want, and they take whatever they.
And, at the end of the tribulation, those believers in Christ, who have been delivered and rescued by Christ, will have free reign, to come and go as they please, and to take whatever they please, because the former owners of the spoils that are left behind, will no longer exist.
Unlike any other time in history, the millennium will begin with believers only. And while their numbers will most likely be small, they will have the entire planet, from which to collect anything and everything that has been left behind by the former population of the world.
Study [by instruction],
to show thyself approved [spiritually mature]
a workman [student]
that need not be ashamed [ignorant],
rightly dividing [learning, understanding, discerning]
the word of truth [Bible doctrine].
If you can dream and not make dreams your master,
If you can think and not let thoughts narrow your views,
If you can meet triumph with disaster equally,
If you can learn and see your full meaning and purpose in life,
Then you can believe in Christ, learn Bible doctrine, and grow far beyond the potential that God has prepared for you.