Parallel
Judges 20:36
Brenton's English Septuagint · Berean Standard Bible
And the children of Benjamin saw that they were smitten; and the men of Israel gave place to Benjamin, because they trusted in the ambuscade which they had prepared against Gabaa.
Then the Benjamites realized they had been defeated. Now the men of Israel had retreated before Benjamin because they were relying on the ambush they had set against Gibeah.