New Revised Standard Version
When all the men of Israel who were in the valley saw that the army had fled and that Saul and his sons were dead, they abandoned their towns and fled; and the Philistines came and occupied them.

Contemporary English Version
The Israelites who lived in Jezreel Valley learned that their army had run away and that Saul and his sons were dead. They ran away too, and the Philistines moved into the towns the Israelites left behind.

New American Bible
When all the Israelites in the valley saw that Saul and his sons had fled and that they had died, they abandoned their cities and fled. Then the Philistines came and lived in those cities.

Douay-Rheims Bible
And when the men of Israel, that dwelt in the plains, saw this, they fled: and Saul and his sons being dead, they forsook their cities, and were scattered up and down: and the Philistines came, and dwelt in them.

And when the men of Israel, that dwelt in the plains, saw this, they fled: and Saul and his sons being dead, they forsook their cities, and were scattered up and down: and the Philistines came, and dwelt in them.

then they

Leviticus 26:31,36 Insomuch that I will bring your cities to be a wilderness: and I will make your sanctuaries desolate: and will receive no more your sweet odours. . . .

Deuteronomy 28:33,43 May a people which thou knowest not, eat the fruits of thy land, and all thy labours: and mayst thou always suffer oppression, and be crushed at all times. . . .

Judges 6:2 And they were grievously oppressed by them. And they made themselves dens and caves in the mountains, and strong holds to resist.

1 Samuel 13:6 And when the men of Israel saw that they were straitened (for the people were distressed), they hid themselves in caves, and in thickets, and in rocks, and in dens, and in pits.

1 Samuel 31:7 And the men of Israel, that were beyond the valley, and beyond the Jordan, seeing that the Israelites were fled, and that Saul was dead, and his sons, forsook their cities, and fled: and the Philistines came and dwelt there.