'Formation' in the Bible

Moses told them, “If the Gadites and Reubenites cross the Jordan with you, every man in battle formation before the Lord, and the land is subdued before you, you are to give them the land of Gilead as a possession.

But if they don’t go across with you in battle formation, they must accept land in Canaan with you.”

We will cross over in battle formation before the Lord into the land of Canaan, but we will keep our hereditary possession across the Jordan.”