Who are Yetur, Nafish [and Nodav]?
'Rashi': Yetur and Nafish [Malbim - and Nodav 1 ] are from Bnei Yishmael.
I did not find any source that Nodav is from Yishmael. (PF)
Was this the war in the days of Sha'ul?
Malbim: No. Then, they took the Hagri'im's tents, and the Hagri'im settled further away. Later, in the days of Yehoachaz Melech Yisrael, Melech Aram overpowered them and made them "ke'Afar Ladush" (Melachim II, 13:7). Then, the Hagri'im returned and settled in their places. In the days of Yarav'am ben Yo'ash, they got stronger and fought the Hagri'im a second time. Then other nations joined the Hagri'im - Yetur, Nafish and Nodav, their brothers 1 .
Malbim holds that the Hagri'im are Bnei Keturah, unlike Radak (10), who explained that they are Bnei Yishmael. (PF)
