Judges 20:38

38 The army of Isra'el and the ambushers had agreed that as a signal they would make a huge cloud of smoke rise from the city,

Judges 20:38 Meaning and Commentary

Judges 20:38

Now there was an appointed sign between the men of Israel and
the liers in wait
Or an appointed time ^F26 as the Targum; so Kimchi and Abarbinel. There was a time fixed, at which the men of Israel proposed to be at Baaltamar, exactly when the Benjaminites would be drawn at a proper distance from the city, and then the liers in wait were to break forth, and rush upon it, and enter it:

and that they should make a great flame with smoke to rise up out of
the city;
set it on fire, and cause the fire to burn fiercely, that there might be a large ascent of flame and smoke to be seen afar off; which, when the men of Israel saw, they would know the city was taken.

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FOOTNOTES:

F26 (dewmh) "tempus constitutum", Panginus, Montanus, Junius et Tremellius, Piscator.

Judges 20:38 In-Context

36 and the people of Binyamin realized that they had been beaten. The men of Isra'el, trusting the ones they had put in place to ambush Binyamin, gave ground to the men of Binyamin.

37 Then the men who had been lying in wait rushed in on Giv'ah, drew their swords and destroyed the city.

38 The army of Isra'el and the ambushers had agreed that as a signal they would make a huge cloud of smoke rise from the city,

39 at which time the men of Isra'el would turn back. When this happened, Binyamin began to attack. They killed about thirty of Isra'el's men and said, "Clearly we're defeating them again, as in the first battle."

40 But when the smoke signal began rising from the city, the men of Binyamin looked behind them and saw the whole city going up to the sky in smoke.