The previous mention of the Philistines as oppressors of Israel Judges 3:31 seems to be restricted to the south of Judah, when they cooperated with Moab. They appear to have gradually increased in power until they reached their height in the time of Saul. In the present instance they were probably in alliance with the Ammonites, holding the western tribes in check, while the Ammonites subdued those on the east of Jordan.
Related Commentaries of Judges 10:7
Judges 10:7
7 And the anger of the LORD was hot against Israel, and he sold them into the hands of the Philistines, and into the hands of the children of Ammon.