Judges 20:38

38 The men of Israel had a prearranged signal with the men in ambush: when they sent up a great cloud of smoke 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 Then the Benjaminites realized they had been defeated. The men of Israel had retreated before Benjamin, because they were confident in the ambush they had set against Gibeah.

37 The men in ambush had rushed quickly against Gibeah; they advanced and put the whole city to the sword.

38 The men of Israel had a prearranged signal with the men in ambush: when they sent up a great cloud of smoke from the city,

39 the men of Israel would return to the battle. When Benjamin had begun to strike them down, killing about 30 men of Israel, they said, "They're defeated before us, just as they were in the first battle."

40 But when the column of smoke began to go up from the city, Benjamin looked behind them, and the whole city was going up in smoke.