Judges 10:8

8 and they crush and oppress the sons of Israel in that year -- eighteen years all the sons of Israel [who] are beyond the Jordan, in the land of the Amorite, which [is] in Gilead.

Judges 10:8 Meaning and Commentary

Judges 10:8

And that year they vexed and oppressed the children of Israel,
&c.] The Philistines on one side, and the children of Ammon on the other; meaning either that year in which Jair died, as Jarchi; or the first year they began to bring them into bondage, as R. Isaiah: "and from that year", as Kimchi and Ben Melech, that they vexed and distressed them, they continued to vex and distress them

eighteen years;
or, as Abarbinel interprets it, "with that year", they vexed and oppressed them eighteen years, that is, so many more, or reckoning that into the number of them; and these eighteen years of their oppression are not to be reckoned into the years of Jair's government, and as commencing from the fourth of it, as Bishop Usher, Lightfoot, and others; for it does not appear that there was any oppression in his days, but from the time of his death to the raising up of Jephthah a new judge: and the people oppressed by the children of Ammon during that time

were all the children of Israel that were on the other side Jordan, in
the land of the Ammonites, which is in Gilead;
even the tribes of Reuben and Gad, and the half tribe of Manasseh.

Judges 10:8 In-Context

6 And the sons of Israel add to do the evil thing in the eyes of Jehovah, and serve the Baalim, and Ashtaroth, and the gods of Aram, and the gods of Zidon, and the gods of Moab, and the gods of the Bene-Ammon, and the gods of the Philistines, and forsake Jehovah, and have not served Him;
7 and the anger of Jehovah burneth against Israel, and He selleth them into the hand of the Philistines, and into the hand of the Bene-Ammon,
8 and they crush and oppress the sons of Israel in that year -- eighteen years all the sons of Israel [who] are beyond the Jordan, in the land of the Amorite, which [is] in Gilead.
9 And the Bene-Ammon pass over the Jordan to fight also against Judah, and against Benjamin, and against the house of Ephraim, and Israel hath great distress.
10 And the sons of Israel cry unto Jehovah, saying, `We have sinned against Thee, even because we have forsaken our God, and serve the Baalim.'
Young's Literal Translation is in the public domain.