Joshua told the Reubenites, Gadites, and the half tribe of Manasseh:

Then Joshua summoned the Reubenites, Gadites, and the half-tribe of Manasseh

Moses the Lord’s servant and the Israelites defeated them and Moses the Lord’s servant assigned their land to Reuben, Gad, and the half tribe of Manasseh.

The other half of Manasseh, Reuben, and Gad received their allotted tribal lands beyond the Jordan, just as Moses, the Lord’s servant, had assigned them.