The book of Jephthah

I went looking for Sihon and Og references. Most of them were in the narrative "Deuteronomic" layer, from Numbers to Joshua; plus those two psalms 135 and 136 certainly based on that layer, and Nehemiah, and the Shapira book if you can stomach that. I did however find one reference to Sihon without Og. This was in a long historical speech by Jephthah the Judge of Gile'ad; son of who-knows and some-ho'. (Seriously man; it's in Judges 10-12.) I am unaware of any Qumranian or Samaritan witness; all the old translations are simply of the MT.

The latest study of the pericope I can find is Elizabeth Bloch-Smith (2015). She got the Israel Finkelstein seal of approval, for what that is worth.

Bloch-Smith so Finkelstein figure Judges 11:14-31 as a Deuteronomic or even postDeuteronomic shpiel, a speech placed in the Biblical figure's mouth as to set up the story at hand. We have evidence of phantom prophecy in Judges 6:7-10; almost the whole first few chapters seem redundant against Joshua. And much of Jephthah's speech parallels Numbers 21, itself problematic.

Of interest, to me anyway, is how Jephthah doesn't mention Og of Bashan in the least. This may be the only Sihon mention as doesn't link him with Og (including Shapira, note!) CORRECTION-SORTA 12/8 - excepting Jeremiah MT 48 with the bare name. Also Jephthah asks rhetorically about Balak ben Zippor of Moab, if he'd ever harmed Israel. According to Numbers, Balak had attempted harm to Israel; in league with the famed local sorcerer Balaam. So Jephthah and, one must assume, the editor of Judges at the time hadn't read Numbers.