[5] The squadron patrolled the waters of the bay and protected the eastern shore of the Bataan Peninsula from Japanese infiltration.

[5] After Manila was declared an open city on 26 December 1941, the squadron operated out of Sisiman Cove, to the immediate east of Cavite and north of Corregidor where the American PT boats of Motor Torpedo Boat Squadron Three were also based.

[5] The squadron, along with its American counterparts, were serviced by the submarine tender Canopus, which was moored at Cavite Naval Base.

[4] The remainder of the squadron was intercepted by Japanese land-based Naval aircraft of the 1st Kōkūtai, and were able to down one plane.

[4] The squadron attacked the destroyers with their torpedoes and machine gun fire but did not score any hits.