And he provided the first part for himself, because there, in a portion of the lawgiver, was he seated; and he came with the heads of the people, he executed the justice of the Lord, and his judgments with Israel. (Deuteronomy 33:21)
The first territory conquered was divided by Moses between Reuben, Gad, and the half tribe of Manasseh (see Num. 32:1, 2, 33).
His judgments.
The Gadites fulfilled their promise to cross over the Jordan and do their part in the conquest of Canaan, until the whole country was subdued (Num. 32:21, 22, 29).