By early 1943 the ships of the New Zealand minesweeping flotilla were patrolling along the Guadalcanal coast. The Americans had landed successfully, but Japanese land, air and sea forces held footholds and were still contesting the islands. Although the destroyers of the nocturnal ‘Tokyo Express’ were still active, the Bird-class ships’ usual targets were small craft and submarines attempting to land troops and supplies.
On the night of 29 January Kiwi and Moa were patrolling along Kamimbo Bay, on the north-western corner of Guadacanal, when Kiwi detected a submarine. It made a depth charge attack, but then lost contact. Kiwi continued to attack and on its third run, the damaged submarine surfaced and attempted to fight it out.
On paper it was two-to-one, but the Japanese sub I-1 was a formidable opponent. At 2135 tons surfaced, the Type J1 class were one and a half times bigger than Moa and Kiwi combined. Undamaged, the sub could outrun them by about five knots. The I-1’s 140-mm gun had greater range and hitting power than the New Zealand ships' 102-mm guns, and it also had powerful torpedoes. No wonder that to the Kiwi’s crew in the dark, the Japanese shells sounded ‘like an express train going through’.
In confined waters the Kiwi’s commander, Lieutenant-Commander Gordon Brisdon, decided to get in close to negate some of the sub’s advantages. But that meant braving a hail of fire from light-calibre weapons. Japanese machine-guns bullets sprayed the Kiwi, mortally wounding Acting Leading Signalman C.H. Buchanan. In pain and bleeding, he remained at his post, lighting up the sub for the gunners with his searchlight.
With a graunching sound, the Kiwi rammed the I-1 right behind the conning tower. Locked together, the vessels continued to blaze away at each other with light weapons. Twice more Brisdon pulled his ship away from the huge submarine only to ram it again, badly damaging his opponent and crumpling his own bows. When Kiwi’s main gun overheated, Moa took over, chasing the submarine until it ran aground on a reef.
