Rashi on TanakhJoshua 12

That the Bnei Yisroel struck. In the days [lifetime] of Moshe.

To the Yabok river, which was the border of the land of the Bnei Amon, the end of the territory of the land of Bnei Amon. From there [the Yabok River] and further the Bnei Amon had dominion.

Half of the Gilod, the boundry of Sichon. That was the border of Sichon’s domain, as we said above,¹See Verse 2. that half of Gilod was his, and this second half was Og’s.