Joshua 22:8-12

and said to them, “Return to your tents with great riches and with very many livestock, with silver, gold, bronze, iron, and with very many clothes; divide the spoils of your enemies with your brothers.”

So the sons of Reuben, the sons of Gad, and the half-tribe of Manasseh returned home, leaving the sons of Israel at Shiloh, which is in the land of Canaan, to go to the land of Gilead, to the land of their possession in which they had settled, in accordance with the command of the Lord through Moses. The Offensive Altar

When they came to the region of the Jordan which is in the land of Canaan, the sons of Reuben, the sons of Gad, and the half-tribe of Manasseh built an altar there by the Jordan, a large altar in appearance.

But the sons of Israel heard a report: “Behold, the sons of Reuben, the sons of Gad, and the half-tribe of Manasseh have built an altar at the frontier of the land of Canaan, in the region of the Jordan, on the side belonging to the sons of Israel.”

And when the sons of Israel heard about it, the entire congregation of the sons of Israel assembled at Shiloh to go up against them in battle.