"Wainwright" charged to the attack, but the submarine submerged almost immediately. Upon reaching the spot where the submarine had been, the warship located an oil slick and began dropping depth charges which failed to achieve positive results. Approaching darkness and the necessity of escorting an Admiralty oiler forced "Wainwright" to break off her attack. After she shepherded the oiler to safety, she returned to the area of her attack and patrolled throughout the night, but the submarine had apparently retired from the neighborhood.