Yahweh's Spirit began to stir him

The word "stir" here refers to causing Samson to act. "Yahweh's Spirit began to cause him to act" or "Yahweh's Spirit began to control him"

Mahaneh Dan ... Eshtaol

Mahaneh Dan is the name of a temporary camp that the tribe of Dan lived in. Eshtaol is the name of a town.