Kongō-class battleship

Kongō-class battleship
Scientific America · Public domain · source
Name	Kongō-class battleship
Caption	Kongō in 1915
Country	Empire of Japan
Builder	Vickers, Kawasaki Heavy Industries, Mitsubishi Heavy Industries
Laid down	1911–1912
Launched	1912–1913
Commissioned	1913–1915
Class after	battlecruiser → fast battleship
Displacement	27,940–36,600 tons (standard/full load)
Length	214.58 m
Beam	28.04 m
Draught	8.23 m
Propulsion	steam turbines; Yarrow boilers → geared turbines
Speed	27–30 knots
Range	8,000 nmi at 14 kn
Complement	~1,300–1,400
Armament	8 × 14-inch guns, 16 × 6-inch guns, AA guns, torpedoes
Armor	belt up to 9 in; deck up to 5 in; turret/barbette armor
Fate	four lost in Battle of Leyte Gulf and world war II losses; one scrapped

Kongō-class battleship The Kongō-class battleships were a quartet of Imperial Japanese Navy capital ships, originally built as battlecruisers in the 1910s and later rebuilt as fast battleships to serve through World War II. Designed and constructed with assistance from Vickers and Japanese yards, the class—Kongō, Hiei, Haruna and Kirishima—played prominent roles in Second Sino-Japanese War, Pacific War, and fleet actions including the Battle of the Java Sea and the Battle of Leyte Gulf. Their conversions and operational use reflect interwar naval policy shaped by the Washington Naval Treaty and the London Naval Treaty.

Design and development

The Kongō class originated from a 1909 procurement by the Imperial Japanese Navy General Staff seeking a fast capital ship to counter Royal Navy developments and protect sea lines near Korea and Manchuria. Design work involved Sir George Thurston-era Vickers designs and consultation with Yoshimoto Yasuzo-era Japanese engineers at Kawasaki Dockyard and Mitsubishi Shipbuilding, producing hulls with high speed and heavy main armament similar to contemporary Lion-class characteristics. Operational requirements were influenced by lessons from the Russo-Japanese War and doctrinal debates involving admirals such as Tōgō Heihachirō and planners aligned with Fleet Faction advocates. The Anglo-Japanese Alliance and industrial capacity at Yokosuka Naval Arsenal and Kure Naval Arsenal shaped construction schedules.

General characteristics

Kongō-class ships measured roughly 214.6 m overall with a beam around 28.0 m and draft near 8.2 m, displacing between 27,940 and 36,600 tons depending on load and reconstruction. Propulsion initially combined high-pressure steam turbines and numerous Yarrow boilers, driving four shafts to achieve speeds of 27–30 knots—values comparable to Nelson-class battleship and contemporary Royal Navy fast units. The ships' electrical systems, communications suites and fire-control installed systems were upgraded over time with gear from Vickers-Armstrongs and domestic firms. Crew complements of about 1,300–1,400 included officers trained at Imperial Japanese Naval Academy in Etajima and ratings from naval districts like Sasebo Naval District.

Armament and armor

Primary armament comprised eight 14-inch (356 mm) guns in four twin turrets, patterned on BL 14 inch Mk VII naval gun performance and paired with early 20th-century rangefinders and director systems influenced by Admiral Sir John Jellicoe-era techniques. Secondary batteries originally featured sixteen 6-inch (152 mm) guns in casemates; anti-aircraft defenses were added progressively with Type 96 AA guns and 25 mm mounts from Kure Arsenal and Mitsubishi. Torpedo tubes were fitted for close action. Armor protection included a belt up to 9 in, decks up to 5 in, and heavy turret and barbette armor—trade-offs between speed and protection echoed debates around HMS Hood and SMS Derfflinger.

Modernization and reconstruction

Between the 1920s and late 1930s the class underwent major reconstructions: reboilering, hull strengthening, new geared turbines, extended forecastles, and increased armor. These refits were responses to constraints and allowances under the Washington Naval Treaty and subsequent London Naval Conference, enabling conversion from battlecruiser to fast battleship to match carrier task force concepts developed by admirals such as Isoroku Yamamoto and Chūichi Nagumo. Upgrades included improved armor belts, anti-torpedo bulges, modernized fire-control with radar installations inspired by Type 93 and foreign radar research, and enhanced Type 21 and Type 22 radar suites.

Operational history

In World War I the class saw limited action escorting convoys and supporting Anglo-Japanese naval cooperation in the Indian Ocean and Mediterranean under the Allies. Interwar deployments included participation in fleet reviews, training cruises to Hawaii and Southeast Asia, and involvement in incidents like the Nanjing Incident during the Second Sino-Japanese War. During the Pacific War, Kongō-class ships escorted aircraft carrier task forces such as those including Akagi, Kaga, Sōryū and Hiryū at the Attack on Pearl Harbor, screened carrier raids in the Indian Ocean Raid alongside HMS Hermes-related operations, and engaged in surface actions including the Battle of Midway aftermath and nighttime engagements in the Solomon Islands campaign and Guadalcanal Campaign. Kirishima notably fought and was sunk during the First Naval Battle of Guadalcanal, while Hiei was crippled in the same campaign. Kongō and Haruna continued to operate in the Philippines and Leyte Gulf theater.

Losses and fate

Hiei was scuttled after surviving damage at Guadalcanal and air attacks by United States Navy carrier planes, while Kirishima was lost in night surface action against battleships including USS Washington and USS South Dakota during Naval Battle of Guadalcanal. Kongō was sunk by the USS Sealion in the Formosa Strait or by submarine torpedo attack during Battle of Leyte Gulf transits; Haruna survived longer but was eventually damaged and scrapped following air raids and the collapse of Japanese logistics in the Philippine Campaign. These losses reflected attrition from United States Pacific Fleet carrier aviation, submarine warfare exemplified by Admiral Charles A. Lockwood-led tactics, and surface actions against Task Force 38.

Legacy and influence

The Kongō-class influenced interwar capital ship design, demonstrating the feasibility of converting battlecruiser hulls into fast battleships to serve carrier-centered fleets advocated by strategists like Isoroku Yamamoto and theorists studying Mahanian sea power at the Naval War College. Their reconstructions set precedents for modernization programs in navies including the Royal Navy and United States Navy, informing armor schemes, propulsion upgrades, and anti-aircraft integration for later battleship classes such as Ise-class battleship hybrids and emergency conversions. Survivors and wreck sites became subjects for historians at institutions like the National Diet Library, preservationists, and maritime archaeologists studying battlefield archaeology and the material culture of Imperial Japan. The class remains widely covered in works about the Pacific War, naval architecture analyses, and museum exhibits in ports like Yokosuka and Kure.

Category:Battleships of the Imperial Japanese Navy Category:World War II naval ships of Japan