Parallel
Numbers 32:17
Brenton's English Septuagint · Berean Standard Bible
and we will arm ourselves and go as an advanced guard before the children of Israel, until we shall have brought them into their place; and our possessions shall remain in walled cities because of the inhabitants of the land.
But we will arm ourselves and be ready (note: LXX we will arm ourselves for battle) to go ahead of the Israelites until we have brought them into their place. Meanwhile, our little ones will remain in the fortified cities for protection from the inhabitants of the land.