Japanese cruiser Chikuma (1938)

Chikuma was designed for long-range scouting missions and had a large seaplane capacity. She was extensively employed during World War II in conjunction with an aircraft carrier task force, or as part of a cruiser squadron with her sister ship, Tone.

The Tone-class cruisers were originally envisaged as the fifth and sixth vessels in the Mogami class. However, by the time construction began, serious weaknesses in the Mogami-class hull design had become clear following the Fourth Fleet Incident in 1935. As Japan no longer was obligated to abide by the limitations of the London Naval Treaty, a new design was created and new means of construction were utilized. Though the external dimensions were close to the Mogami class, the design was quite different, with four main battery turrets placed forward of the bridge, the second superfiring over the first, reserving the entire stern area as a large sea plane hangar. Unlike the United States Navy, the Japanese did not have a dual role attack/scout aircraft. No reconnaissance units were assigned to the Japanese carriers, and little emphasis was placed on this aspect of carrier warfare. Instead the Japanese reserved all of their carrier aircraft for attack roles. Reconnaissance was left up to float planes carried by cruisers.^[3] Chikuma was intended to provide the long range scout planes needed for their carrier Air Fleets.

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Seaplane

Seaplane

A seaplane is a powered fixed-wing aircraft capable of taking off and landing (alighting) on water. Seaplanes are usually divided into two categories based on their technological characteristics: floatplanes and flying boats; the latter are generally far larger and can carry far more. Seaplanes that can also take off and land on airfields are in a subclass called amphibious aircraft, or amphibians. Seaplanes were sometimes called hydroplanes, but currently this term applies instead to motor-powered watercraft that use the technique of hydrodynamic lift to skim the surface of water when running at speed.

Aircraft carrier

Aircraft carrier

An aircraft carrier is a warship that serves as a seagoing airbase, equipped with a full-length flight deck and facilities for carrying, arming, deploying, and recovering aircraft. Typically, it is the capital ship of a fleet, as it allows a naval force to project air power worldwide without depending on local bases for staging aircraft operations. Carriers have evolved since their inception in the early twentieth century from wooden vessels used to deploy balloons to nuclear-powered warships that carry numerous fighters, strike aircraft, helicopters, and other types of aircraft. While heavier aircraft such as fixed-wing gunships and bombers have been launched from aircraft carriers, these aircraft have not landed on a carrier. By its diplomatic and tactical power, its mobility, its autonomy and the variety of its means, the aircraft carrier is often the centerpiece of modern combat fleets. Tactically or even strategically, it replaced the battleship in the role of flagship of a fleet. One of its great advantages is that, by sailing in international waters, it does not interfere with any territorial sovereignty and thus obviates the need for overflight authorizations from third-party countries, reduces the times and transit distances of aircraft and therefore significantly increase the time of availability on the combat zone.

Sister ship

Sister ship

A sister ship is a ship of the same class or of virtually identical design to another ship. Such vessels share a nearly identical hull and superstructure layout, similar size, and roughly comparable features and equipment. They often share a common naming theme, either being named after the same type of thing or person or with some kind of alliteration. Typically the ship class is named for the first ship of that class. Often, sisters become more differentiated during their service as their equipment are separately altered.

Japanese cruiser Tone (1937)

Japanese cruiser Tone (1937)

Tone (利根) was the lead ship in the two-vessel Tone class of heavy cruisers in the Imperial Japanese Navy. The ship was named after the Tone River, in the Kantō region of Japan and was completed on 20 November 1938 at Mitsubishi's Nagasaki shipyards. Tone was designed for long-range scouting missions and had a large seaplane capacity. She was extensively employed during World War II usually providing scouting services to their aircraft carrier task forces. She almost always operated in this capacity in conjunction with her sister ship Chikuma.

Mogami-class cruiser

Mogami-class cruiser

The Mogami class (最上型) was a ship class of four cruisers built for the Imperial Japanese Navy (IJN) during the 1930s. They were initially classified as light cruisers under the weight and armament restrictions of the London Naval Treaty. After Japan abrogated that agreement, all four ships were rearmed with larger guns and reclassified as heavy cruisers. All participated in World War II and were sunk.

London Naval Treaty

London Naval Treaty

The London Naval Treaty, officially the Treaty for the Limitation and Reduction of Naval Armament, was an agreement between the United Kingdom, Japan, France, Italy, and the United States that was signed on 22 April 1930. Seeking to address issues not covered in the 1922 Washington Naval Treaty, which had created tonnage limits for each nation's surface warships, the new agreement regulated submarine warfare, further controlled cruisers and destroyers, and limited naval shipbuilding.

Bridge (nautical)

Bridge (nautical)

The bridge, also known as the pilothouse or wheelhouse, is a room or platform of a ship from which the ship can be commanded. When a ship is under way, the bridge is manned by an officer of the watch aided usually by an able seaman acting as a lookout. During critical maneuvers the captain will be on the bridge, often supported by an officer of the watch, an able seaman on the wheel and sometimes a pilot, if required.

United States Navy

United States Navy

The United States Navy (USN) is the maritime service branch of the United States Armed Forces and one of the eight uniformed services of the United States. It is the largest and most powerful navy in the world, with the estimated tonnage of its active battle fleet alone exceeding the next 13 navies combined, including 11 allies or partner nations of the United States as of 2015. It has the highest combined battle fleet tonnage and the world's largest aircraft carrier fleet, with eleven in service, two new carriers under construction, and five other carriers planned. With 336,978 personnel on active duty and 101,583 in the Ready Reserve, the United States Navy is the third largest of the United States military service branches in terms of personnel. It has 290 deployable combat vessels and more than 2,623 operational aircraft as of June 2019.

Early career

Chikuma firing her main guns, 1940

Chikuma was completed at Mitsubishi Nagasaki shipyards on 20 May 1939. After several months as a unit of the CruDiv6 (Sentai 6) of the Second Fleet, she was transferred to the CruDiv8 in November 1939. In addition to taking part in regular combat exercises in Japanese home waters, she operated off southern China on three occasions between March 1940 and March 1941.

Early stages of the Pacific War

At the end of 1941, Chikuma was assigned to CruDiv 8 with its sister ship, Tone, and was thus one of the key players in the attack on Pearl Harbor. On 7 December 1941, Tone and Chikuma each launched one Aichi E13A1 Type 0 "Jake" floatplane for a final weather reconnaissance over Oahu. At 0630, Tone and Chikuma each launched short range Nakajima E4N2 Type 90-2 Reconnaissance Seaplane to act as pickets and patrol south of the Striking Force. Chikuma's floatplane reported nine anchored American battleships (presumably counting Utah as a battleship). During the subsequent attack, the battleships Arizona, Oklahoma, West Virginia and California were sunk and Nevada, Pennsylvania, Tennessee, Maryland and other smaller ships were damaged.

On 16 December, CruDiv 8 was ordered to assist in the second attempted invasion of Wake Island. Anti-aircraft fire damaged the scout plane from Chikuma, which was forced to ditch, but the crew was rescued. After the fall of Wake Island, CruDiv 8 returned to Kure.

On 14 January 1942, CruDiv 8 was based out of Truk in the Caroline Islands, and covered the landings of Japanese troops at Rabaul, New Britain and attacks on Lae and Salamaua, New Guinea. On 24 January Chikuma's floatplanes attacked the Admiralty Islands.

After the air raid on Kwajalein on 1 February by Vice Admiral William Halsey, Jr's aircraft carrier USS Enterprise, Chikuma departed Truk with the Carrier Striking Force in an unsuccessful pursuit. Chikuma and Tone later participated in the Raid on Port Darwin, Australia on 19 February, sinking 11 ships. From 25 February 1942, Chikuma was involved in supporting the Japanese invasion of Java.

Battle of the Java Sea

On 1 March 1942, Chikuma's floatplane located the 8,806-ton Dutch freighter Modjokerto attempting to escape from Tjilatjap to Australia. Chikuma, with Tone, and destroyers Kasumi and Shiranui intercepted and sank the freighter before noon. That afternoon, CruDiv 8's spotted the old destroyer USS Edsall, 250 miles (400 km) south-southeast of Christmas Island. Chikuma opened fire with her 8-inch guns at the extremely long range of 11 miles (18 km), and all shots missed. Chikuma was joined by battleships Hiei and Kirishima, which also opened fire with their 14-inch main batteries, but Edsall not only managed to avoid 297 14-inch, 132 6-inch shells from the battleships and an additional 844 8-inch and 62 5-inch rounds from the cruisers, but the destroyer also closed to range and fired its 4-inch guns at Chikuma. Hits from Hiei, Tone and dive bombers from the aircraft carriers Sōryū and Akagi finally stopped Edsall, which was then finished off by Chikuma.

On 4 March, Chikuma sank the 5,412-ton Dutch merchant Enggano (which had earlier been damaged by a floatplane from the cruiser Takao). On 5 March, floatplanes from Tone and Chikuma took part on the strike against Tjilatjap. After the surrender of the Dutch East Indies, Chikuma was assigned to Indian Ocean operations.

Indian Ocean raids

On 5 April 1942, Chikuma was part of a major task force which launched 315 aircraft against British-held Colombo, Ceylon. The destroyer HMS Tenedos, armed merchant cruiser Hector and 27 aircraft were destroyed and over 500 killed in harbor, and the cruisers HMS Cornwall and Dorsetshire were destroyed at sea. After searching for more remnants of the Royal Navy, the Indian Ocean Task Force launched 91 Aichi D3A1 "Val" dive-bombers and 41 Mitsubishi A6M2 "Zeke" fighters on 9 April against the British naval base at Trincomalee, Ceylon. They found the harbor empty, but wrecked the base's facilities and shot down nine planes, and later sank the carrier HMS Hermes, destroyer HMAS Vampire, and corvette HMS Hollyhock, an oiler and a depot ship at sea 65 miles (105 km) from base.

The task force with Chikuma returned to Japan in mid-April 1942, where it was almost immediately assigned to the unsuccessful pursuit of Admiral Halsey's Task Force 16.2 with the aircraft carrier USS Hornet after the Doolittle Raid.

Battle of Midway

At the crucial Battle of Midway, Chikuma and CruDiv 8 were in Vice Admiral Chuichi Nagumo's Carrier Striking Force. On 4 June, Tone and Chikuma each launched two Aichi E13A1 "Jake" long-range reconnaissance floatplanes to search out 300 miles (480 km) for American carriers. The floatplane from Tone discovered American ships, but did not recognize that the fleet was a carrier group, which proved to be a crucial mistake. Chikuma's floatplane found the aircraft carrier USS Yorktown, and shadowed the ship for the next three hours, guiding the bombers that attacked Yorktown that evening. Two other floatplanes from Chikuma continued to observe the heavily damaged Yorktown through the night, during which time one plane and crew were lost. Chikuma then directed the submarine I-168 to find and attack the Yorktown the following morning.

Chikuma and Tone were then detached to support Vice Admiral Boshiro Hosogaya's Aleutian invasion force. However, the anticipated American counter-attack failed to materialize. CruDiv 8 cruised northern waters uneventfully. Chikuma returned to Ominato port on 24 June.

Rear Admiral Chuichi Hara assumed command of CruDiv 8 from 14 July 1942. With the US invasion of Guadalcanal, Chikuma and Tone were ordered south again on 16 August with the aircraft carriers Shōkaku, Zuikaku, Zuihō, Jun'yō, Hiyō and Ryūjō. They were joined by the battleships Hiei, Kirishima, seaplane tender Chitose, and cruisers Atago, Maya, Takao, Nagara.

Battle of the Eastern Solomons

On 24 August 1942, CruDiv 7's Kumano and Suzuya arrived to join the reinforcement fleet for Guadalcanal. The following morning, a PBY Catalina seaplane spotted Ryūjō, which SBDs and TBFs from Enterprise unsuccessfully attacked. Seven floatplanes from Tone and Chikuma were launched to locate the American fleet. One of Chikuma's planes spotted the Americans, but was shot down before its report could be relayed. However, a second floatplane was more successful, and the Japanese launched an attack against Enterprise, hitting it with three bombs which set her wooden deck on fire. However, in the meantime, the Americans located the Japanese fleet, and Ryūjō was sunk by planes from the aircraft carrier USS Saratoga. Chikuma was undamaged in this engagement, and returned to Truk safely.

Through October, Chikuma and Tone patrolled north of the Solomon Islands, waiting word of recapture of Henderson Field by the Japanese.

Battle of Santa Cruz

Chikuma under aerial attack during the Battle of Santa Cruz.

Chikuma being bombed in the attack on Rabaul, on 5 November 1943.

On 26 October 1942, 250 miles (400 km) northeast of Guadalcanal, Rear Admiral Hiroaki Abe's task force launched seven floatplanes to scout south of Guadalcanal. They located the American fleet, and Abe followed with an attack which sank Hornet and damaged the battleship South Dakota and cruiser San Juan. However, Chikuma was attacked by a Douglas SBD Dauntless dive-bomber from Hornet, and quick thinking crewmen jettisoned her torpedoes seconds before a 500 lb (230 kg) bomb hit her starboard forward torpedo room. She was also hit by two other bombs, destroying one floatplane on the aircraft catapult. Chikuma suffered 190 killed and 154 wounded including Captain Komura.

Chikuma (escorted by the destroyers Urakaze and Tanikaze) returned to Truk for emergency repairs, and was then sent back to Kure with the damaged carrier Zuihō. During refit and repairs, two additional twin Type 96 25-mm AA guns and a Type 21 air-search radar were added. Repairs were completed by 27 February 1943.

On 15 March 1943 Rear Admiral Kishi Fukuji assumed command of CruDiv 8, and Chikuma was ordered back to Truk. However, on 17 May, Chikuma and Tone were tasked to accompany the battleship Musashi back to Tokyo for the state funeral of Admiral Isoroku Yamamoto. Chikuma was back in Truk by 15 July, having avoided numerous submarine attacks along the route.

From July to November, Chikuma was engaged in making troop transport runs to Rabaul, and to patrols of the Marshall Islands in unsuccessful pursuit of the American fleet. While refueling at Rabaul on 5 November 1943, Chikuma and its task force were attacked by 97 planes from the carriers Saratoga, and Princeton. Cruisers Atago, Takao, Maya, Mogami, Agano and Noshiro were damaged. Chikuma, attacked by a single SBD, suffered only near-misses with minor damage.

Back at Kure on 12 December, Chikuma gained additional 25-mm AA guns, bringing its total to 20. CruDiv 8 was disbanded on 1 January 1944, and both Tone and Chikuma were reassigned to CruDiv 7 (with Suzuya and Kumano) under Rear Admiral Shoji Nishimura. Refit completed by 1 February, Chikuma returned to Singapore on 13 February and Batavia on 15 March after a month of raiding commerce in the Indian Ocean. On 20 March 1944, Rear Admiral Kazutaka Shiraishi assumed command of CruDiv 7, and Chikuma was made flagship.

Battle of the Philippine Sea

On 13 June 1944, Admiral Soemu Toyoda activated "Operation A-GO" for the defense of the Mariana Islands. Chikuma was assigned to Force "C" Vice Admiral Jisaburo Ozawa's Mobile Fleet, which proceeded through the Visayan Sea to the Philippine Sea headed towards Saipan. On 20 June, after the battleships Haruna, Kongō and carrier Chiyoda were attacked by aircraft from the American carriers Bunker Hill, Monterey and Cabot and the bulk of the Japanese air cover was destroyed in the "Great Marianas Turkey Shoot", Chikuma retired with the Mobile Fleet to Okinawa.

After ferrying army troops to Okinawa, Chikuma was reassigned back to Singapore in July, serving as flagship for CruDiv 4 while Atago was under repairs.

Battle of Leyte Gulf

Chikuma under aerial attack during Battle off Samar in the Battle of Leyte Gulf, 25 October 1944. The ship's stern has been severely damaged by a torpedo hit, but the ship's outboard propellers are still keeping her somewhat moving.

On 23 October 1944, Chikuma (with Kumano, Suzuya and Tone) sortied from Brunei towards the Philippines with Vice Admiral Takeo Kurita's First Mobile Striking Force. In the Battle of the Palawan Passage, Atago and Maya were sunk by submarines, and Takao damaged. In the Battle of the Sibuyan Sea the following day Musashi was sunk, the cruiser Myōkō was crippled and had to be towed to safety, while the battleships Nagato and Haruna received damage.

On 25 October, during the Battle off Samar, Chikuma engaged U.S. escort aircraft carriers, helping to sink USS Gambier Bay, but came under fire from the American destroyer USS Heermann and heavy air attack. Chikuma inflicted severe damage on Heermann, but was soon attacked by four TBM Avenger torpedo-bombers. Richard Deitchman, flying from USS Manila Bay, succeeded in hitting her stern port quarter with a Mark 13 torpedo that severed her stern and disabled her port screw and rudder. Chikuma's speed dropped to 18 knots (33 km/h), then to 9 knots (17 km/h), but more seriously, she became unsteerable. At 1105, Chikuma was attacked by five TBMs from USS Kitkun Bay. She was hit portside amidships by two torpedoes and her engine rooms flooded. At 1400, three TBMs from a composite squadron of ships from USS Ommaney Bay and Natoma Bay led by Lt. Joseph Cady dropped more torpedoes which hit Chikuma portside. Cady was later awarded the Navy Cross for his action. It is generally thought that the Japanese destroyer Nowaki took off survivors from Chikuma, and then scuttled her at 11°25′N 126°36′E / 11.417°N 126.600°E / 11.417; 126.600Coordinates: 11°25′N 126°36′E / 11.417°N 126.600°E / 11.417; 126.600 in the late morning of on 25 October 1944, but a more recent study suggests Chikuma sank from the effect of the air attack, and Nowaki only arrived in time to pick up survivors from the water.^[4]

On 26 October 1944, Nowaki was sunk by gunfire from the cruisers USS Vincennes, Biloxi and Miami and DesDiv 103's Miller, Owen and Lewis Hancock. The ship sank 65 miles (105 km) south-southeast of Legaspi, Philippines with about 1,400 men, including all but one of Chikuma's surviving crewmen. The sole survivor from Chikuma was a crew member who was not picked up by Nowaki and drifted ashore on his own.^[5]

Chikuma was removed from the navy list on 20 April 1945.

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Mitsubishi Heavy Industries

Mitsubishi Heavy Industries

Mitsubishi Heavy Industries, Ltd. is a Japanese multinational engineering, electrical equipment and electronics corporation headquartered in Tokyo, Japan. MHI is one of the core companies of the Mitsubishi Group and its automobile division is the predecessor of Mitsubishi Motors.

Attack on Pearl Harbor

Attack on Pearl Harbor

The attack on Pearl Harbor was a surprise military strike by the Imperial Japanese Navy Air Service upon the United States against the U.S. naval base at Pearl Harbor in Honolulu, Territory of Hawaii, just before 8:00 a.m. on Sunday, December 7, 1941. The United States was a neutral country at the time; the attack led to its formal entry into World War II the next day. The Japanese military leadership referred to the attack as the Hawaii Operation and Operation AI, and as Operation Z during its planning.

Aichi E13A

Aichi E13A

The Aichi E13A was a long-range reconnaissance seaplane used by the Imperial Japanese Navy (IJN) from 1941 to 1945. Numerically the most important floatplane of the IJN, it could carry a crew of three and a bombload of 250 kg (550 lb). The Navy designation was "Navy Type Zero Reconnaissance Seaplane" (零式水上偵察機).

Oahu

Oahu

Oahu, also known as "The Gathering Place", is the third-largest of the Hawaiian Islands. It is home to roughly one million people—over two-thirds of the population of the U.S. state of Hawaii. The island of O’ahu and the Northwestern Hawaiian Islands constitute the City and County of Honolulu. The state capital, Honolulu, is on Oʻahu's southeast coast. Oʻahu had a population of 1,016,508 according to the 2020 U.S. Census, up from 953,207 in 2010.

Battleship

Battleship

A battleship is a large armored warship with a main battery consisting of large caliber guns. It dominated naval warfare in the late 19th and early 20th centuries.

USS Arizona (BB-39)

USS Arizona (BB-39)

USS Arizona was a battleship built for the United States Navy in the mid-1910s. Named in honor of the 48th state, she was the second and last ship in the Pennsylvania class. After being commissioned in 1916, Arizona remained stateside during World War I but escorted President Woodrow Wilson to the subsequent Paris Peace Conference. The ship was deployed abroad again in 1919 to represent American interests during the Greco-Turkish War. Two years later, she was transferred to the Pacific Fleet, under which the ship would remain for the rest of her career.

USS California (BB-44)

USS California (BB-44)

USS California (BB-44) was the second of two Tennessee-class battleships built for the United States Navy between her keel laying in October 1916 and her commissioning in August 1921. The Tennessee class was part of the standard series of twelve battleships built in the 1910s and 1920s, and were developments of the preceding New Mexico class. They were armed with a battery of twelve 14-inch (356 mm) guns in four three-gun turrets. California served as the flagship of the Battle Fleet in the Pacific Ocean for the duration of her peacetime career. She spent the 1920s and 1930s participating in routine fleet training exercises, including the annual Fleet Problems, and cruises around the Americas and further abroad, such as a goodwill visit to Australia and New Zealand in 1925.

USS Maryland (BB-46)

USS Maryland (BB-46)

USS Maryland (BB-46), also known as "Old Mary" or "Fighting Mary" to her crewmates, was a Colorado-class battleship. She was the third ship of the United States Navy to be named in honor of the seventh state. She was commissioned in 1921, and serving as the flagship of the fleet, cruised to Australia, New Zealand, and Brazil.

Battle of Wake Island

Battle of Wake Island

The Battle of Wake Island was a battle of the Pacific campaign of World War II, fought on Wake Island. The assault began simultaneously with the attack on Pearl Harbor naval and air bases in Hawaii on the morning of 8 December 1941, and ended on 23 December, with the surrender of American forces to the Empire of Japan. It was fought on and around the atoll formed by Wake Island and its minor islets of Peale and Wilkes Islands by the air, land, and naval forces of the Japanese Empire against those of the United States, with Marines playing a prominent role on both sides.

Kure, Hiroshima

Kure, Hiroshima

Kure is a port and major shipbuilding city situated on the Seto Inland Sea in Hiroshima Prefecture, Japan. With a strong industrial and naval heritage, Kure hosts the second-oldest naval dockyard in Japan and remains an important base for the Japan Maritime Self-Defence Force (JMSDF) named, JMSDF Kure Naval Base. As of 1 May 2015, the city has an estimated population of 228,030 and a population density of 646 persons per km2. The total area is 352.80 km2.

Chuuk Lagoon

Chuuk Lagoon

Chuuk Lagoon, previously Truk Atoll, is an atoll in the central Pacific. It lies about 1,800 kilometres northeast of New Guinea, and is part of Chuuk State within the Federated States of Micronesia (FSM). A protective reef, 225 kilometres (140 mi) around, encloses a natural harbour 79 by 50 km, with an area of 2,130 km2 (820 sq mi). It has a land area of 93.07 square kilometres, with a population of 36,158 people and a maximal elevation of 443 metres (1,453 ft). Weno city on Moen Island functions as both the atoll's capital and the state capital, and is the largest city in the FSM with its 13,700 people.

Caroline Islands

Caroline Islands

The Caroline Islands are a widely scattered archipelago of tiny islands in the western Pacific Ocean, to the north of New Guinea. Politically, they are divided between the Federated States of Micronesia (FSM) in the central and eastern parts of the group, and Palau at the extreme western end. Historically, this area was also called Nuevas Filipinas or New Philippines, because they were part of the Spanish East Indies and were governed from Manila in the Philippines.