was an admiral in the

Imperial Japanese Navy The Imperial Japanese Navy (IJN; Kyūjitai: Shinjitai: ' 'Navy of the Greater Japanese Empire', or ''Nippon Kaigun'', 'Japanese Navy') was the navy of the Empire of Japan from 1868 to 1945, when it was dissolved following Japan's surrender ...

during

World War II World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the World War II by country, vast majority of the world's countries—including all of the great power ...

. He directed Japanese forces involved in the

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 (7 December ...

Biography

A native of

Ehime prefecture is a prefecture of Japan located on the island of Shikoku. Ehime Prefecture has a population of 1,342,011 (1 June 2019) and has a geographic area of 5,676 km2 (2,191 sq mi). Ehime Prefecture borders Kagawa Prefecture to the northeast, T ...

, Kajioka graduated from the 39th class of the

Imperial Japanese Naval Academy The was a school established to train line officers for the Imperial Japanese Navy. It was originally located in Nagasaki, moved to Yokohama in 1866, and was relocated to Tsukiji, Tokyo in 1869. It moved to Etajima, Hiroshima in 1888. Students st ...

in 1911. He placed 6th out of 138 cadets. He served as

midshipman A midshipman is an officer of the lowest rank, in the Royal Navy, United States Navy, and many Commonwealth navies. Commonwealth countries which use the rank include Canada (Naval Cadet), Australia, Bangladesh, Namibia, New Zealand, South Af ...

on the cruisers and , and after being commissioned as an

ensign An ensign is the national flag flown on a vessel to indicate nationality. The ensign is the largest flag, generally flown at the stern (rear) of the ship while in port. The naval ensign (also known as war ensign), used on warships, may be diffe ...

, on the . His training was in navigation, and after his promotion to

lieutenant A lieutenant ( , ; abbreviated Lt., Lt, LT, Lieut and similar) is a commissioned officer rank in the armed forces of many nations. The meaning of lieutenant differs in different militaries (see comparative military ranks), but it is often ...

he served as chief navigator on the , and . Kajioka was promoted to

lieutenant commander Lieutenant commander (also hyphenated lieutenant-commander and abbreviated Lt Cdr, LtCdr. or LCDR) is a commissioned officer rank in many navies. The rank is superior to a lieutenant and subordinate to a commander. The corresponding ran ...

in 1924, and was assigned as chief navigator to the , and

battleship A battleship is a large armour, armored warship with a main artillery battery, battery consisting of large caliber guns. It dominated naval warfare in the late 19th and early 20th centuries. The term ''battleship'' came into use in the late 1 ...

. Kajioka was given his first command of a warship on December 1, 1935 when he was promoted to captain of the . He subsequently commanded ''Kasuga'' and ''Kiso''. Kajioka was promoted to

rear admiral Rear admiral is a senior naval flag officer rank, equivalent to a major general and air vice marshal and above that of a commodore and captain, but below that of a vice admiral. It is regarded as a two star " admiral" rank. It is often rega ...

on November 15, 1940. At the start of the

Pacific War The Pacific War, sometimes called the Asia–Pacific War, was the theater of World War II that was fought in Asia, the Pacific Ocean, the Indian Ocean, and Oceania. It was geographically the largest theater of the war, including the vas ...

, Kajioka was in command of the

Wake Island Wake Island ( mh, Ānen Kio, translation=island of the kio flower; also known as Wake Atoll) is a coral atoll in the western Pacific Ocean in the northeastern area of the Micronesia subregion, east of Guam, west of Honolulu, southeast of T ...

invasion force, consisting of Cruiser Division 18 with the cruisers , , ; Destroyer Division 29 (, ); Destroyer Division 30 (, , , ); and transports with the No. 2 Maizuru

Special Naval Landing Force The Special Naval Landing Forces (SNLF; ja, 海軍特別陸戦隊, Kaigun Tokubetsu Rikusentai) were naval infantry units of the Imperial Japanese Navy (IJN) and were a part of the IJN Land Forces. They saw extensive service in the Second Sino ...

. Overly confident that the island's defenses had been reduced by air bombardment, his forces suffered heavy casualties in the first phase of the

before being forced to retreat. ''Hayate'' and ''Kisaragi'' were sunk, and ''Yubari'' was hit 11 times by shells fired by the

Marine Marine is an adjective meaning of or pertaining to the sea or ocean. Marine or marines may refer to: Ocean * Maritime (disambiguation) * Marine art * Marine biology * Marine debris * Marine habitats * Marine life * Marine pollution Military ...

defenders. Perhaps surprisingly for the Japanese Naval Command, he was not relieved of his command after this failure, allowing him a second try. The second assault on Wake Island, reinforced with heavy cruisers and the aircraft carriers and , was more successful. Kajioka was then assigned to command the invasion of Lae,

New Guinea New Guinea (; Hiri Motu: ''Niu Gini''; id, Papua, or , historically ) is the world's second-largest island with an area of . Located in Oceania in the southwestern Pacific Ocean, the island is separated from Australia by the wide Torres ...

in March 1942. He narrowly escaped disaster when the

US 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 ...

launched a counterattack across the

Owen Stanley Range Owen Stanley Range is the south-eastern part of the central mountain-chain in Papua New Guinea. Its highest point is Mount Victoria at , while its most prominent peak is Mount Suckling. History Owen Stanley Range was seen in 1849 by Captain Ow ...

, which damaged many ships in the invasion fleet, but after troops and supplies had already been landed. Kajioka was later in the

Battle of the Coral Sea The Battle of the Coral Sea, from 4 to 8 May 1942, was a major naval battle between the Imperial Japanese Navy (IJN) and naval and air forces of the United States and Australia. Taking place in the Pacific Theatre of World War II, the batt ...

in May 1942 as commander of the Port Moresby invasion force. However, the invasion was cancelled before troops could be landed. Kajioka was recalled to Japan, and was sent to the reserves from the end of 1942 through early 1944. He was reactivated, and given command of the No. 6 Escort Division on 8 April 1944. In April and May he commanded the

Take Ichi convoy The was a Japanese convoy of World War II. The convoy left Shanghai on 17 April 1944, carrying two infantry divisions to reinforce Japan's defensive positions in the Philippines and western New Guinea. United States Navy (USN) submarines ...

, which suffered heavy losses while carrying two Army divisions from China to New Guinea. Kajioka was killed in action on September 12, 1944 when his destroyer was torpedoed by east of

Hainan Hainan (, ; ) is the smallest and southernmost province of the People's Republic of China (PRC), consisting of various islands in the South China Sea. , the largest and most populous island in China,The island of Taiwan, which is slightly l ...

. He was posthumously promoted to vice admiral.

References

Books

* * * * *

External links

*
The Defense of Wake
* * *

Notes

{{DEFAULTSORT:Kajioka, Sadamichi Japanese admirals of World War II 1891 births 1944 deaths Military personnel from Ehime Prefecture Imperial Japanese Navy admirals Japanese military personnel killed in World War II Battle of Wake Island