Burning the Crops
The shenanigans at Samson's marriage, and the giving of his wife to another, provoked him into taking vengeance on the Philistine oppressors. He wrought havoc on their harvest. To do this, he trapped foxes—or jackals, as the Hebrew can also be translated (which seems more likely as jackals, unlike the more solitary foxes, traveled in packs, making it easier to catch them in greater numbers). He then tied torches—“firebrands" as the King James Version has it—between the tails of pairs of these jackals or foxes before releasing them into fields of grain, vineyards and olive groves. One can imagine the panic-stricken animals, unable to run in a straight line, zigzagging all over the fields, setting them on fire wherever they ran, thus burning whole crops. Samson became a wanted man, and it was his own people who turned him over to the Philistines.
Another element in the Christlike symbolism of Samson's life: Samson is turned over to the Philistine oppressors by Israelites of the tribe of Judah; Christ is turned over to the Roman oppressors by Israelites of the tribe of Judah.
Samson then slew a thousand Philistine men with the jawbone of a donkey. His utterance in verse 16 after slaying the Philistines is poetic, as the New King James Version indicates. However, the translation into English does not do justice to the Hebrew play on words. The Moffatt Translation is perhaps better: "With the jawbone of an ass I have piled them in a mass." At least Samson realizes that the strength and power he had to perform this incredible feat came from God. "You have given this great deliverance by the hand of Your servant," he acknowledges (verse 18). He even calls on God to further deliver Him from thirst, which God does.
All this is building to a grand climax as God continues to seek an occasion to deal with the Philistines.