1 Samuel 31:7

When the men of Israel who were on the other side of the valley [of Jezreel], and those who were beyond the Jordan, saw that the other men of Israel had fled and that Saul and his sons were dead, they abandoned the cities and fled; then the Philistines came and lived in them.

Leviticus 26:32

I will make the land desolate, and your enemies who settle in it will be appalled at it.

Leviticus 26:36

As for those who are left of you, I will bring despair (lack of courage, weakness) into their hearts in the lands of their enemies; the sound of a scattered leaf will put them to flight, and they will flee as if [running] from the sword, and will fall even when no one is chasing them.

Deuteronomy 28:33

A people whom you do not know will eat the produce of your land and all the products of your labors, and you will never be anything but oppressed and exploited and crushed continually.

Judges 6:2

The [powerful] hand of Midian prevailed against Israel. Because of Midian the sons of Israel made for themselves the dens (hideouts) which were in the mountains, and the caves and the [mountain] strongholds.

1 Samuel 13:6

When the men of Israel saw that they were in a tight situation (for their troops were hard-pressed), they hid in caves, in thickets, in cellars, and in [dry] cisterns (pits).

Treasury of Scripture Knowledge

Summary

And when the men of Israel that were on the other side of the valley, and they that were on the other side Jordan, saw that the men of Israel fled, and that Saul and his sons were dead, they forsook the cities, and fled; and the Philistines came and dwelt in them.

General references

Bible References

They forsook the cities

1 Samuel 13:6
When the men of Israel saw that they were in a tight situation (for their troops were hard-pressed), they hid in caves, in thickets, in cellars, and in [dry] cisterns (pits).
Leviticus 26:32
I will make the land desolate, and your enemies who settle in it will be appalled at it.
Deuteronomy 28:33
A people whom you do not know will eat the produce of your land and all the products of your labors, and you will never be anything but oppressed and exploited and crushed continually.
Judges 6:2
The [powerful] hand of Midian prevailed against Israel. Because of Midian the sons of Israel made for themselves the dens (hideouts) which were in the mountains, and the caves and the [mountain] strongholds.

General references

2 Samuel 4:3
and the Beerothites fled to Gittaim, and have been resident aliens there to this day).