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.
KJV
So the children of Benjamin saw that they were smitten: for the men of Israel gave place to the Benjamites, because they trusted unto the liers in wait which they had set beside Gibeah.
ASV
So the children of Benjamin saw that they were smitten; for the men of Israel gave place to Benjamin, because they trusted unto the liers-in-wait whom they had set against Gibeah.