The shelling of Port Gregory took place on 28 January 1943 during World War II. The attack was conducted by the Japanese submarine I-165, under the command of Lieutenant Commander Tatenosuke Tosu, as a part of attempts to divert Allied attention away from the evacuation of Japanese forces from Guadalcanal, in the Solomon Islands. None of the 10 shells fired at Port Gregory caused any damage, and the attack was not noticed by the Allied naval authorities until a radio signal sent by Tosu was intercepted and decoded a week later.

Purpose

During the Pacific War Japanese submarines occasionally operated off Western Australia. In early 1943, the major Japanese headquarters directed their forces to make small attacks on Allied positions, in an attempt to divert attention away from the planned evacuation of Guadalcanal, Operation Ke. In mid-January, the commander of the Japanese Southwest Area Fleet ordered I-165 to attack Allied shipping off north-western Australia. As part of the fleet's contribution to diversionary operations, I-165 was also directed to bombard a coastal Australian town. It is likely that the busy port of Geraldton was the original target for the bombardment.

I-165 sailed from Surabaya in the occupied Dutch East Indies on 21 January 1943. (Another Japanese submarine, I-166, was ordered to conduct a similar mission against the Cocos Islands.)

The attack
On the evening of 27 January, I-165, arrived just north of Geraldton. While preparing for the attack, the crew of I-165 sighted three aircraft and a surface vessel that Tosu believed was a destroyer. Consequently, Tosu decided to postpone the bombardment, and to withdraw further north, temporarily. While running on the surface, the submarine passed within  of what was identified as a destroyer, without being noticed.

The following evening, just after midnight, I-165 surfaced  off Port Gregory. From a range of , her crew fired about 10 rounds from the submarine's 100 mm (3.9-inch) Type 88 deck gun, at a derelict crayfish cannery, which they had misidentified as an ammunition factory. None of the shells caused any damage. Tosu did not attempt to observe the results of the bombardment, and resumed patrolling off the coast of Western Australia.

Two Australian coastwatchers stationed near Port Gregory noticed gunfire at night on 28 January, but neither observed any shells landing. Allied naval authorities only learned of the attack when the submarine's battle report radio signal was intercepted and decoded a week later. I-165 returned to Surabaya on 16 February without having sunk any Allied ships during her patrol.

Australian naval historian David Stevens noted that, in terms of its objective as a diversion, the bombardment was "an abject failure". Within Allied naval circles, it was regarded as a "graphic example of the poor planning and inadequate doctrine so common in the Japanese submarine force".

The attack on Port Gregory was one of three submarine shellings on Australian towns and cities, the other two being the attacks on Newcastle and Sydney in June 1942.

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Conflicts in 1943
1943 in Australia
Port Gregory
Battles and conflicts without fatalities
1940s in Western Australia