And Samson went and caught three hundred foxes, and took firebrands, and turned tail to tail, and put a firebrand in the midst between two tails.

Wesley's Notes

15:4 Foxes - Of which there were great numbers in Canaan. But it is not said that Samson caught them all, either at one time, or by his own hands; for being so eminent a person, and the judge of Israel, he might require assistance of as many persons as he pleased. And it must be allowed, that the God who made the world, and by his singular providence watched over Israel, and intended them deliverance at this time, could easily dispose things so that they might be taken. He chose to do this not by his brethren, whom he would preserve from the hatred and mischief which it might have occasioned them, but by brute creatures, thereby to add scorn to their calamity, and particularly by foxes; partly, because they were fittest for the purpose, being creatures very fearful of fire; and having such tails as the fire - brands might most conveniently be tied to; and not going directly forward, but crookedly, whereby the fire would be dispersed in more places. Fire - brands - Made of such matter as would quickly take fire, and keep it for a long time; which was easy to procure. And put, and c. - That the foxes might not make too much haste, nor run into their holes, but one of them might delay another, and so continue longer in the places where they were to do execution.

King James Translators' Notes

firebrands: or, torches

Jamieson-Fausset-Brown Bible Commentary

4, 5. went and caught three hundred foxes-rather, "jackals"; an animal between a wolf and a fox, which, unlike our fox, a solitary creature, prowls in large packs or herds and abounds in the mountains of Palestine. The collection of so great a number would require both time and assistance.

took firebrands-torches or matches which would burn slowly, retaining the fire, and blaze fiercely when blown by the wind. He put two jackals together, tail by tail, and fastened tightly a fire match between them. At nightfall he lighted the firebrand and sent each pair successively down from the hills, into the "Shefala," or plain of Philistia, lying on the borders of Dan and Judah, a rich and extensive corn district. The pain caused by the fire would make the animals toss about to a wide extent, kindling one great conflagration. But no one could render assistance to his neighbor: the devastation was so general, the panic would be so great.

Matthew Henry's Concise Commentary

15:1-8 When there are differences between relations, let those be reckoned the wisest and best, who are most forward to forgive or forget, and most willing to stoop and yield for the sake of peace. In the means which Samson employed, we must look at the power of God supplying them, and making them successful, to mortify the pride and punish the wickedness of the Philistines. The Philistines threatened Samson's wife that they would burn her and her father's house. She, to save herself and oblige her countrymen, betrayed her husband; and the very thing that she feared, and by sin sought to avoid, came upon her! She, and her father's house, were burnt with fire, and by her countrymen, whom she thought to oblige by the wrong she did to her husband. The mischief we seek to escape by any unlawful practices, we often pull down upon our own heads.