Changes

After refit and a brief training period, Barbero departed Fremantle on her second war patrol on 26 October. On this patrol, Comdr. Hartman also assumed command of a coordinated attack group consisting of Barbero, Haddo (SS-255), and Redfin (SS-272). The first phase of this two-part patrol lasted from 26 October until 15 November. It was conducted in the Makassar Strait and in the area west of Mindoro. On 2 November, after a lively passage of Lombok Strait during which picket boats and shore batteries fired on her, Barbero sank her first ship, a 2,700-ton transport loaded with troops. On 8 November, she sent a 7,500-ton tanker to the bottom during a coordinated attack on a small convoy carried out in cooperation with Redfin. Redfin received credit for sinking the other tanker in the convoy.

After refit and a brief training period, Barbero departed Fremantle on her second war patrol on 26 October. On this patrol, Comdr. Hartman also assumed command of a coordinated attack group consisting of Barbero, Haddo (SS-255), and Redfin (SS-272). The first phase of this two-part patrol lasted from 26 October until 15 November. It was conducted in the Makassar Strait and in the area west of Mindoro. On 2 November, after a lively passage of Lombok Strait during which picket boats and shore batteries fired on her, Barbero sank her first ship, a 2,700-ton transport loaded with troops. On 8 November, she sent a 7,500-ton tanker to the bottom during a coordinated attack on a small convoy carried out in cooperation with Redfin. Redfin received credit for sinking the other tanker in the convoy.

Following a three-day stop at Mios Woendi to rearm with torpedoes and perform minor upkeep, the submarine embarked on the second portion of the patrol. That longer phase lasted from 18 November 1944 to 2 January 1945 and was conducted in the South China Sea northeast of Borneo. On 24 December in an attack on an escorted four-ship convoy, a 7,500-ton gasoline tanker was sunk and a second tanker grossing about 5,000 tons was damaged. On Christmas day, the submarine claimed her gift from the Japanese in the form of a 4,000-ton cargo ship that she sank. On 27 December, while she attempted the perilous repassage of Lombok Strait, fragments from an aerial bomb that narrowly missed Barbero close aboard aft damaged her port reduction gear. The damage forced her to cover the distance remaining to Fremantle on a single screw. In 68 days away from Fremantle, Barbero returned having sunk four ships totalling 21,700 tons and claiming damage to a fifth of 5,000 tons.

Following a three-day stop at Mios Woendi to rearm with torpedoes and perform minor upkeep, the submarine embarked on the second portion of the patrol. That longer phase lasted from 18 November 1944 to 2 January 1945 and was conducted in the South China Sea northeast of Borneo. On 24 December in an attack on an escorted four-ship convoy, a 7,500-ton gasoline tanker was sunk and a second tanker grossing about 5,000 tons was damaged. On Christmas Day, the submarine claimed her gift from the Japanese in the form of a 4,000-ton cargo ship that she sank. On 27 December, while she attempted the perilous repassage of Lombok Strait, fragments from an aerial bomb that narrowly missed Barbero close aboard aft damaged her port reduction gear. The damage forced her to cover the distance remaining to Fremantle on a single screw. In 68 days away from Fremantle, Barbero returned having sunk four ships totalling 21,700 tons and claiming damage to a fifth of 5,000 tons.

The damage to her port reduction gear required Barbero to return to the United States for repairs. She arrived at the Portsmouth (N.H.) Navy Yard for overhaul on 7 March 1945. After the repairs, an overhaul and some additional training at the Submarine Base at New London, Conn., she set out to rejoin the Pacific Fleet. During the Panama-to-Pearl Harbor leg of her voyage back into the war, hostilities ended. After spending two weeks at the Submarine Base, Pearl Harbor, Barbero received orders to return to the west coast in September 1945 for deactivation. The submarine arrived at the Mare Island Navy Yard on 6 September 1945. She underwent preinactivation overhaul and was placed out of commission, in reserve, early in October 1946.

The damage to her port reduction gear required Barbero to return to the United States for repairs. She arrived at the Portsmouth (N.H.) Navy Yard for overhaul on 7 March 1945. After the repairs, an overhaul and some additional training at the Submarine Base at New London, Conn., she set out to rejoin the Pacific Fleet. During the Panama-to-Pearl Harbor leg of her voyage back into the war, hostilities ended. After spending two weeks at the Submarine Base, Pearl Harbor, Barbero received orders to return to the west coast in September 1945 for deactivation. The submarine arrived at the Mare Island Navy Yard on 6 September 1945. She underwent preinactivation overhaul and was placed out of commission, in reserve, early in October 1946.