Why did Samsun set fire to the tails of 300 tied together foxes?

ANSWER

to set fire to the Philistine fields of grain

Judges 15 :

3 Samson said to them, “This time I have a right to get even with the Philistines; I will really harm them.” 4 So he went out and caught three hundred foxes and tied them tail to tail in pairs. He then fastened a torch to every pair of tails, 5 lit the torches and let the foxes loose in the standing grain of the Philistines. He burned up the shocks and standing grain, together with the vineyards and olive groves.
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