John Gill Commentary Joshua 12:6

"Moses the servant of Jehovah and the children of Israel smote them: and Moses the servant of Jehovah gave it for a possession unto the Reubenites, and the Gadites, and the half-tribe of Manasseh." — Joshua 12:6 (ASV)

Them did Moses the servant of the Lord, and the children of
Israel, smite
That is, the inhabitants of those kingdoms they smote with the edge of the sword, and took possession of them, the history of which see in (Numbers 21:1–3Numbers 21:21–35) ;

and Moses the servant of the Lord gave it ;
the whole dominion of the two kings before mentioned:

[for] a possession unto the Reubenites, and the Gadites, and the half
tribe of Manasseh :
of which grant, and the conditions of it, see (Numbers 32:1–42) .