Half the tribe of Manasseh - That is, (compare Numbers 32:39; Joshua 17:1) the families of Machir. Moses, when assigning to the pastoral tribes the inheritance which they desired, appropriated to these Manassites especially the district they had already subdued, as a reward for their valour and exploits. Thus the whole of the conquered country was provisionally disposed of, and the forwardness anti valour of the Machirites rewarded. It seems clear from Numbers 32:39 and Joshua 17:1, that the claims of the Machirites arose simply out of their exploits.
Related Commentaries of Numbers 32:33
Numbers 32:33
33 And Moses gave unto them, even to the children of Gad, and to the children of Reuben, and unto half the tribe of Manasseh the son of Joseph, the kingdom of Sihon king of the Amorites, and the kingdom of Og king of Bashan, the land, with the cities thereof in the coasts, even the cities of the country round about.