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| Operation Judgment | |
|---|---|
| Name | Operation Judgment |
| Partof | Second World War |
| Date | 4 June 1945 |
| Place | Kure, Seto Inland Sea |
| Result | Allied tactical success; significant damage to Imperial Japanese Navy vessels and infrastructure |
| Combatant1 | Royal Navy Fleet Air Arm; British Pacific Fleet |
| Combatant2 | Imperial Japanese Navy; Imperial Japanese Army |
| Commander1 | Bruce Fraser; Cedric Holland |
| Commander2 | Soemu Toyoda; Mitsumasa Yonai |
| Strength1 | Aircraft carriers (Indomitable, Formidable, Implacable, Victorious); carrier air groups |
| Strength2 | Battleships, cruisers, destroyers, repair facilities at Kure Naval Base |
| Casualties1 | Aircraft losses and aircrew casualties; carrier damage minimal |
| Casualties2 | Several capital ships damaged or sunk; shore installations damaged; personnel casualties |
Operation Judgment
Operation Judgment was the final major British carrier air strike against the remaining elements of the Imperial Japanese Navy at the naval base of Kure in the Seto Inland Sea on 4 June 1945. Conducted by the British Pacific Fleet and its Fleet Air Arm, it aimed to destroy capital ships, repair yards, and logistics nodes to prevent any coherent Japanese naval sortie. The attack took place in the closing weeks of the Pacific War and has been studied in relation to naval aviation, carrier tactics, and late-war Allied strategy.
By mid-1945 the Imperial Japanese Navy had been reduced following engagements such as the Battle of Leyte Gulf and sustained attrition from United States Pacific Fleet operations and air raids. The remaining battleships, cruisers, and escorts were concentrated at home ports including Kure Naval District and Yokosuka. The British Pacific Fleet, formed in 1944 and integrated into Operation Iceberg and subsequent operations alongside the United States Navy, planned offensive actions to neutralize remaining Japanese naval threats and support broader Allied objectives. Political considerations involving Prime Minister Winston Churchill's government and coordination with Admiral Chester W. Nimitz influenced target selection and timing.
British staff officers in Admiralty and commanders of the British Pacific Fleet identified the Kure anchorage and surrounding repair infrastructure as primary objectives to interdict ship repair and sortie capability. Objectives included sinking or immobilizing capital ships, destroying drydocks and logistical depots at Kure Naval Base, and degrading anti-aircraft defenses. Planners referenced intelligence from Royal Navy reconnaissance, Ultra-derived signals, and photographic reconnaissance provided by Photographic Reconnaissance Unit assets. Coordination with Joint Chiefs of Staff-level liaison officers and carrier air group commanders set a strike package composed of torpedo bombers, dive-bombers, and fighter-bombers drawn from carriers such as Implacable and Formidable.
The British strike force fell under the operational control of Bruce Fraser, commanding the British Pacific Fleet. Carrier task groups were led by senior aviators and captains from Fleet Air Arm squadrons, with air commanders responsible for strike coordination and fighter cover. Opposing forces at Kure included surface units of the Imperial Japanese Navy—battleship remnants, cruisers, destroyers—and shore-based anti-aircraft formations tied to the Kure Naval Arsenal and elements of the Imperial Japanese Army tasked with coastal defense. Command arrangements on the Japanese side involved district commanders and senior naval staff charged with harbor defense and ship repair.
On 4 June 1945 carrier air groups launched coordinated waves of strikes in the morning and early afternoon. Torpedo-bombers and Fairey Barracuda-type aircraft mounted anti-ship attacks while fighter-bombers and dive-bombers targeted drydocks, workshops, and ammunition depots. Fighter screens from Supermarine Seafire and Grumman F6F Hellcat types escorted strike elements and suppressed interceptors. Airborne photographic teams documented damage for battle assessment. Defenders employed layered anti-aircraft fire from shore batteries and escort vessels; however, concentrated British strike tactics, timing, and the use of low-level torpedo approaches achieved surprise in several sectors of the anchorage.
Strikes resulted in substantial damage to several major vessels, including immobilization or sinking of battleship or cruiser hull targets and destruction of repair facilities at Kure Naval Arsenal. Shore infrastructure—drydocks, workshops, and supply depots—sustained hits that reduced repair throughput. Allied aircraft losses included several shot down or lost to anti-aircraft fire and operational accidents, producing aircrew casualties and prisoners taken by Japanese forces. Japanese personnel casualties from shipboard detonations and harbor explosions numbered in the hundreds, and material losses further degraded remaining fleet readiness.
The strike accelerated the operational incapacitation of surviving Imperial Japanese Navy surface units by denying repair and sortie capacity at Kure, reinforcing maritime dominance for Allied carrier forces in the Pacific Ocean. It complemented United States Navy carrier raids and United States Army Air Forces strategic bombing by focusing on maritime repair infrastructure. Politically, the operation underscored the Royal Navy's capacity to conduct independent large-scale carrier operations in the Pacific theatre. In the post-strike weeks remaining Japanese surface units were unable to mount significant offensive operations, contributing to Allied pressure that culminated in Japan's unconditional surrender following the Atomic bombings of Hiroshima and Nagasaki and the Soviet–Japanese War.
Debate among historians has focused on proportionality, target selection, and the timing of strikes so late in the Pacific War, alongside questions about the balance between British and American strategic priorities. Scholars referencing operational reports, survivor testimony, and photographic evidence have examined the efficacy of Fleet Air Arm tactics and the human cost among naval personnel and dockworkers. The raid has been commemorated in naval histories, veterans' accounts, and museum exhibits that connect Royal Navy carrier aviation heritage to wider narratives of the Second World War maritime campaigns. Modern analyses consider the operation in studies of carrier strike doctrine and late-war Allied coalition operations.
Category:Pacific theatre of World War II