To defeat King Sihon and King Og was to defeat the two “gate guards” of the land of Canaan (see note Num. 21:12). This was the initiation of the taking possession of the good land. The land of those two kings was given to the tribes of Reuben and Gad and the half-tribe of Manasseh (vv. 12-13) as the firstfruits of the enjoyment of the God-promised land (see Num. 32).