The Mariana and Palau Islands campaign, also known as Campaign Plan Granite II, was an offensive launched by the
United States
The United States of America (USA), also known as the United States (U.S.) or America, is a country primarily located in North America. It is a federal republic of 50 U.S. state, states and a federal capital district, Washington, D.C. The 48 ...
against
Imperial Japanese
The Empire of Japan, also known as the Japanese Empire or Imperial Japan, was the Japanese nation state that existed from the Meiji Restoration on January 3, 1868, until the Constitution of Japan took effect on May 3, 1947. From 1910 to 19 ...
forces in the
Pacific
The Pacific Ocean is the largest and deepest of Earth's five oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean, or, depending on the definition, to Antarctica in the south, and is bounded by the cont ...
between June and November 1944 during the
Pacific War
The Pacific War, sometimes called the Asia–Pacific War or the Pacific Theatre, was the Theater (warfare), theatre of World War II fought between the Empire of Japan and the Allies of World War II, Allies in East Asia, East and Southeast As ...
. The campaign consisted of Operation Forager, which captured the
Mariana Islands
The Mariana Islands ( ; ), also simply the Marianas, are a crescent-shaped archipelago comprising the summits of fifteen longitudinally oriented, mostly dormant volcanic mountains in the northwestern Pacific Ocean, between the 12th and 21st pa ...
, and Operation Stalemate, which captured
Palau
Palau, officially the Republic of Palau, is an island country in the Micronesia subregion of Oceania in the western Pacific Ocean. The Republic of Palau consists of approximately 340 islands and is the western part of the Caroline Islands ...
.
Operation Causeway
Operation Causeway was a planned United States invasion of Formosa (Taiwan), the Quemoys (Kinmen Islands) and Xiamen Bay on the southeastern coast of Mainland China during World War II. At that time, Formosa was a Japanese colony since the nine ...
, an invasion of Japanese-controlled
Taiwan
Taiwan, officially the Republic of China (ROC), is a country in East Asia. The main geography of Taiwan, island of Taiwan, also known as ''Formosa'', lies between the East China Sea, East and South China Seas in the northwestern Pacific Ocea ...
, was also planned but not executed. The offensive, under the overall command of
Chester W. Nimitz
Chester William Nimitz (; 24 February 1885 – 20 February 1966) was a fleet admiral in the United States Navy. He played a major role in the naval history of World War II as Commander in Chief, US Pacific Fleet, and Commander in Chief, ...
, followed the
Gilbert and Marshall Islands campaign
The Gilbert and Marshall Islands campaign was a series of engagements fought from August 1942 to February 1944, in the Pacific War, Pacific theatre of World War II between the United States and Empire of Japan, Japan. They were the first battl ...
and was intended to neutralize Japanese bases in the central Pacific, support the
Allied drive to retake the
Philippines
The Philippines, officially the Republic of the Philippines, is an Archipelagic state, archipelagic country in Southeast Asia. Located in the western Pacific Ocean, it consists of List of islands of the Philippines, 7,641 islands, with a tot ...
, and provide bases for a
strategic bombing campaign against Japan.
The United States assembled a significant combined arms task force to undertake the campaign. The Fifth Fleet was commanded by Admiral
Raymond A. Spruance. Task Force 58, commanded by Vice Admiral
Marc Mitscher
Marc Andrew "Pete" Mitscher (January 26, 1887 – February 3, 1947) was a pioneer in naval aviation who became an admiral in the United States Navy, and served as commander of the Fast Carrier Task Force in the Pacific during World War II.
E ...
, consisted of 15 carriers, 7 battleships, 11 cruisers, 86 destroyers and over 900 planes. The amphibious invasion force, commanded by Vice Admiral
Richmond K. Turner
Admiral Richmond Kelly Turner (May 27, 1885 – February 12, 1961), commonly known as Kelly Turner, was an admiral of the United States Navy during the Second World War, where he commanded the Amphibious Force in the Pacific theater. Turner w ...
, consisted of 56 attack transports, 84 landing craft and over 127,000 troops.
[The Great Courses. ''World War II: The Pacific Theater''. Lecture 14. Professor Craig Symonds]
At the beginning of the campaign,
United States Marine Corps
The United States Marine Corps (USMC), also referred to as the United States Marines or simply the Marines, is the maritime land force service branch of the United States Department of Defense. It is responsible for conducting expeditionar ...
and
United States Army
The United States Army (USA) is the primary Land warfare, land service branch of the United States Department of Defense. It is designated as the Army of the United States in the United States Constitution.Article II, section 2, clause 1 of th ...
forces, with support from the
United States Navy
The United States Navy (USN) is the naval warfare, maritime military branch, service branch of the United States Department of Defense. It is the world's most powerful navy with the largest Displacement (ship), displacement, at 4.5 millio ...
, executed landings on
Saipan
Saipan () is the largest island and capital of the Northern Mariana Islands, an unincorporated Territories of the United States, territory of the United States in the western Pacific Ocean. According to 2020 estimates by the United States Cens ...
in June 1944. In response, 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, Potsdam Declaration, when it was dissolved followin ...
's
Combined Fleet
The was the main sea-going component of the Imperial Japanese Navy. Until 1933, the Combined Fleet was not a permanent organization, but a temporary force formed for the duration of a conflict or major naval maneuvers from various units norm ...
sortied to attack the U.S. Navy force supporting the landings. In the resulting
Battle of the Philippine Sea
The Battle of the Philippine Sea was a major naval battle of World War II on 19–20 June 1944 that eliminated the Imperial Japanese Navy's ability to conduct large-scale carrier actions. It took place during the United States' amphibious r ...
(also known as the "Great Marianas Turkey Shoot") on 19–20 June, the Japanese naval forces were decisively defeated with heavy and irreplaceable losses to their carrier-borne and land-based aircraft.
U.S. forces landed on
Saipan
Saipan () is the largest island and capital of the Northern Mariana Islands, an unincorporated Territories of the United States, territory of the United States in the western Pacific Ocean. According to 2020 estimates by the United States Cens ...
in June 1944 and on
Guam
Guam ( ; ) is an island that is an Territories of the United States, organized, unincorporated territory of the United States in the Micronesia subregion of the western Pacific Ocean. Guam's capital is Hagåtña, Guam, Hagåtña, and the most ...
and
Tinian
Tinian () is one of the three principal islands of the Commonwealth of the Northern Mariana Islands (CNMI). Together with uninhabited neighboring Aguiguan, it forms Tinian Municipality, one of the four constituent municipalities of the Northern ...
in July 1944. After heavy fighting, Saipan was secured in July and Guam and Tinian in August 1944. The U.S. then constructed airfields on Saipan and Tinian from which
B-29
The Boeing B-29 Superfortress is a retired American four-engined Propeller (aeronautics), propeller-driven heavy bomber, designed by Boeing and flown primarily by the United States during World War II and the Korean War. Named in allusion to ...
s were able to conduct strategic bombing missions against the
Japanese home islands
The is an archipelago of 14,125 islands that form the country of Japan. It extends over from the Sea of Okhotsk in the northeast to the East China and Philippine seas in the southwest along the Pacific coast of the Eurasian continent, and cons ...
until the end of World War II, including the
nuclear attacks on
Hiroshima
is the capital of Hiroshima Prefecture in Japan. , the city had an estimated population of 1,199,391. The gross domestic product (GDP) in Greater Hiroshima, Hiroshima Urban Employment Area, was US$61.3 billion as of 2010. Kazumi Matsui has b ...
and
Nagasaki
, officially , is the capital and the largest Cities of Japan, city of Nagasaki Prefecture on the island of Kyushu in Japan.
Founded by the Portuguese, the port of Portuguese_Nagasaki, Nagasaki became the sole Nanban trade, port used for tr ...
.
In the meantime, in order to secure the flank for U.S. forces preparing to attack Japanese forces in the Philippines, U.S. Marine and Army forces landed on the islands of
Peleliu
Peleliu (or Beliliou) is an island in the island nation of Palau. Peleliu, along with two small islands to its northeast, forms one of the sixteen states of Palau. The island is notable as the location of the Battle of Peleliu in World War II.
...
and
Angaur
, or in Palauan, is an island and state in the Island country, island nation of Palau.
History
Angaur was traditionally divided among some eight clans. Traditional features within clan areas represent important symbols giving identity to fam ...
in
Palau
Palau, officially the Republic of Palau, is an island country in the Micronesia subregion of Oceania in the western Pacific Ocean. The Republic of Palau consists of approximately 340 islands and is the western part of the Caroline Islands ...
in September 1944. After heavy fighting, both islands were finally secured by U.S. forces in November 1944, while the main Japanese garrison in the Palaus on Koror was bypassed altogether, only to surrender in August 1945 with the
Japan’s capitulation.
Following their landings in the Mariana and Palau Islands, Allied forces continued their ultimately successful campaign against Japan by landing in the
Philippines
The Philippines, officially the Republic of the Philippines, is an Archipelagic state, archipelagic country in Southeast Asia. Located in the western Pacific Ocean, it consists of List of islands of the Philippines, 7,641 islands, with a tot ...
in October 1944 and the
Volcano and Ryukyu Islands beginning in January 1945.
Operations
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Battle of Saipan
The Battle of Saipan was an amphibious assault launched by the United States against the Empire of Japan during the Pacific War, Pacific campaign of World War II between 15 June and 9 July 1944. The initial invasion triggered the Battle of the ...
, 15 June – 9 July 1944
*
Battle of Guam, 21 July – 10 August 1944
*
Battle of Tinian
The Battle of Tinian was part of the Pacific War, Pacific campaign of World War II. It was fought between the United States and Japan on the island of Tinian in the Mariana Islands from 24 July until 1 August 1944. The battle saw napalm used f ...
, 24 July – 1 August 1944
*
Battle of Peleliu
The Battle of Peleliu, codenamed Operation Stalemate II by the United States Armed Forces, US military, was fought between the United States and Empire of Japan, Japan during the Mariana and Palau Islands campaign of World War II, from 15 Septe ...
, 15 September – 27 November 1944
*
Battle of Angaur
The Battle of Angaur was a major battle of the Pacific War, Pacific campaign in World War II, fought on the island of Angaur in the Palau Islands from 17 September to 22 October 1944. This battle was part of a larger offensive campaign known a ...
, 17 September – 22 October 1944
See also
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West Loch disaster
References
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External links
{{DEFAULTSORT:Mariana And Palau Islands Campaign
Mariana and Palau Islands campaign
Battles of World War II involving the United States