On 7 December 1941, Canopus, aging but able, lay at Cavite Navy Yard, as tender to Submarine Squadron 20. In the anxious days that followed, her men worked day and night to repair ships damaged in the daily air raids as well as to keep her brood of submarines at sea. With the Army falling back on Manila, Canopus sailed to Mariveles Bay at the tip of Bataan on Christmas Day. On 29 December 1941 and 1 January 1942, she received direct bomb hits which resulted in substantial damage to the ship and injuries to 13 of her men. Working at fevered pace, her men continued to care for other ships while keeping their own afloat and in operation. To prevent further Japanese attack, smoke pots were placed around the ship and the appearance of an abandoned hulk was presented by day, while the ship hummed with activity by night.
Just before the New Year, the last of the submarines left Canopus, but her activity continued as she cared for small craft and equipment of the Army and Navy, sent her men into battle in the improvised naval battalion which fought so gallantly on Bataan, converted her own launches into miniature gunboats which attacked the Japanese moving south near the shore. But the overwhelming Japanese strength could not be held off forever, and upon the surrender of Bataan on 9 April, Canopus was ordered scuttled and sunk, to deny her use to the enemy. On 10 April, she was proudly backed off into deep water under her own power, and the brave veteran whom the Japanese could not sink ended a lifetime of service to the Navy when she was laid to rest by her own men.
