Source · the work in full
Rashi on the Former Prophets
Chapter 12
Joshua 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, that half of Gilod was his, and this second half was Og’s.
The Dor region. The provinces of Dor.
You arrive at the cited line; the whole work is yours to read around it. The text is set from the cited public-domain edition.