Ambrose of Milan, on Judg 20:27

“And inquired of him concerning their state. At that time the ark of the covenant of the Lord was there,”

“Begging the Lord's peace, they returned more boldly to war, and they to whom prayer had given courage and who had entertained much hope were now able to do what they planned. On a pretext of withdrawing their front lines, setting ambushes at night in the rear of the city, where a segment of the enemy was located, they followed as some retired and thus were provided with an opportunity for invading the unprotected city. Fires were quickly set and flared up while raging flames and waves of heat revealed the sight of the taken city.”

Imported from an open dataset — not yet checked against the printed edition.