RN:
Aircraft carrier HMS Hermes with County class heavy cruiser HMS Dorsetshire, circa 1942
On 5 April 1942, HMS
Hermes and HMAS
Vampire were sent to Trincomalee to prepare for
Operation Ironclad, the British invasion of Madagascar, and 814 Squadron was sent ashore. After advance warning of a Japanese air raid on 9 April 1942, they left Trincomalee and sailed south down the Ceylon coast before it arrived. They were spotted off Batticaloa, however, by a Japanese reconnaissance plane from the battleship
Haruna. The British intercepted the spot report and ordered the ships to return to Trincomalee with the utmost dispatch and attempted to provide fighter cover for them. The Japanese launched 85
Aichi D3A dive bombers, escorted by nine
Mitsubishi A6M Zero fighters, at the two ships. At least 32 attacked them and sank them in quick order despite the arrival of six
Fairey Fulmar II fighters of
No. 273 Squadron RAF. Another six Fulmars from 803 and
806 Squadrons arrived after
Hermes had already sunk. The rest of the Japanese aircraft attacked other ships further north, sinking the
RFA Athelstone of 5,571
gross register tonnage (GRT), her escort, the
corvette Hollyhock, the
oil tanker SS British Sergeant and the Norwegian ship
SS Norviken of 2,924 GRT.
Hermes sank with the loss of 307 men, including Captain Onslow.
Vampire's captain and seven crewmen were also killed. Most of the survivors of the attack were picked up by the hospital ship
Vita. Japanese losses to all causes were four D3As lost and five more damaged, while two Fulmars were shot down