HMAS Castlemaine - Operational History

Operational History

After commissioning, Castlemaine sailed to Sydney, where she was involved in training exercises and convoy escort along the east coast of Australia. On the night of 11 August 1942, the corvette collided with a Manly ferry, requiring a week of repairs at Cockatoo Island Dockyard.

After repairs, Castlemaine was ordered to Townsville, then assigned to Darwin in October: at both locations the ship was tasked with supporting and supplying Allied guerrilla operations in Timor. In late November 1942, the RAN was called on to evacuate the commandoes of the 2/2nd Independent Company (an evacuation attempt in September failed when the destroyer HMAS Voyager grounded and was scuttled after being badly damaged by attacking Japanese aircraft), a contingent of Dutch troops, and over 100 Portuguese civilians, while delivering a relief contingent. Castlemaine, sister ship Armidale, and the auxiliary patrol boat Kuru were assigned to the operation by Commodore Cuthbert Pope, Naval Officer in Charge Darwin, with Castlemaine the commanding ship. The plan was for Kuru to reach Betano Bay early on the night of 30 November, offload supplies, and take on the civilians. The two corvettes were to arrive two hours later; Kuru would deliver her passengers to Castlemaine, which was to head for Darwin at first opportunity, then shuttle relief troops aboard Armidale to shore while evacuating the soldiers.

The corvettes sailed from Darwin at midday on 29 November, leaving just as Japanese aircraft flew over the harbour. At 09:00 on 30 November, the two ships were located by a Japanese reconnaissance plane, but were unable to shoot it down. Because of the likelihood of attack during the day and the distance from the destination, the ships radioed Darwin and suggested that the mission be aborted, but Pope instructed they were to continue after steering away from their intended destination for an hour, and promised fighter support. Armidale and Castlemaine were attacked at midday by 14 Japanese bombers, but these were driven off by a force of Bristol Beaufighters, which then returned to Australia. Another attack came at 14:00, but neither side was able to do damage. Delays from the evasive course and two air attacks meant the corvettes reached Betano Bay after 02:30 on 1 December, with no sign of Kuru, and retreated to sea. Kuru was sighted at daybreak-assuming the covettes were not coming, her commander chose to sail for Darwin with the civilians-and the civilians were transferred to Castlemaine. Although as senior ship, Castlemaine's commanding officer felt he should return to Betano Bay with the soldiers, the troops were aboard the other corvette, and at 11:00 he ordered (with Commodore Pope's approval) Armidale and Kuru to return by separate routes and attempt the operation again that night. Although Castlemaine returned without trouble, Armidale was attacked and sunk by Japanese aircraft on 1 December.

On 15 December, Castlemaine was escorting the merchant ships Period and James Cook to Thursday Island when they were attacked by Japanese aircraft. Four of Period's crew were killed, and the three ships were attacked two more times on 15 December, and a fourth time on 16 December. No further damage was sustained, with the aircraft driven off by the corvette's anti-aircraft armament on all four occasions.

Following the Allied withdrawal from Timor in early 1943, Castlemaine was assigned to minesweeping and escort duties in northern Australian waters. This continued until the end of 1943, when she was reassigned to the convoy escort role between Queensland and New Guinea. In August 1944, the corvette was tasked with survey duties in Australia waters, before sailing to Hong Kong for the Japanese surrender in September 1945.

The ship was granted three battle honours for her wartime service: "Darwin 1942-43", "Pacific 1942-43", and "New Guinea 1942-44".