וַיַּֽעַמְדוּ֙ אִ֣ישׁ תַּחְתָּ֔יו סָבִ֖יב לַֽמַּחֲנֶ֑ה וַיָּ֧רָץ כָּל־הַֽמַּחֲנֶ֛ה וַיָּרִ֖יעוּ ויניסו [וַיָּנֽוּסוּ׃]
And they stood every man in his place round about the camp; and all the host ran; and they shouted, and fled.
Rashi on Judges
They sounded the alarm. The signal to withdraw and flee.