Then the Philistines said, Who has done this? They said, Samson, the son-in-law of the Timnite, because he has taken his wife, and given her to his companion. The Philistines came up, and burnt her and her father with fire.
The word translated "foxes" (Judges 15:4) probably refers to jackals. Foxes are solitary animals, but jackals run in packs and are relatively easy to capture.