East Sea Campaign

The East Sea Campaign was a naval operation which took place during the closing days of the Vietnam War in April 1975. Even though it had no significant impact on the final outcome of the war, the capture of certain South Vietnamese-held Spratly Islands (Trường Sa) in the South China Sea (referred to by the Vietnamese as the East Sea), and other islands on the southeastern coast of Vietnam by the Vietnam People's Navy (VPN) and the Viet Cong helped the Socialist Republic of Vietnam assert its sovereignty over the various groups of islands after the reunification of the country in 1975. The North Vietnamese objective was to capture all the islands under the occupation of the Army of the Republic of Vietnam (ARVN), and it eventually ended in complete victory for the North Vietnamese.


In 1975, as units of the People's Army of Vietnam (PAVN) were pushing toward Saigon as part of the 1975 Spring Offensive, the North Vietnamese High Command decided to capture all South Vietnamese-occupied islands located on the southeastern coast of Vietnam, and in the South China Sea. Subsequently, different units of the VPN were deployed to coordinate their forces with local Viet Cong units in South Vietnam to take the Spratlys and other territories.[4]

During the 1970s the Spratly islands was already a source of dispute for many countries in the region; Malaysia, the People's Republic of China (Communist China), the Republic of China (Taiwan), the Philippines and South Vietnam all claimed sovereignty over all or parts of the islands. In early 1975 the underlying tension between the claimants came to the surface when South Vietnam invaded Southwest Cay, then occupied by the military forces of its wartime ally, the Philippines. In order to lure the Philippines soldiers off Southwest Cay, it was reported that South Vietnamese authorities sent prostitutes to the birthday party of the Philippine military commander on another island.[5][6]

While the Philippine soldiers left their post to attend the birthday party of their commanding officer, South Vietnamese soldiers moved in to occupy Southwest Cay. After the Philippines military realized they had lost their territory, they planned to retake the island from the South Vietnamese through military force. By the time the Philippines military were able to put their plan into action, the South Vietnamese had already built a strong defense on Southwest Cay, thus deterring any potential counter-attack. Later Southwest Cay would be the first major target for the North Vietnamese Navy.[5]


North Vietnam

On April 4, 1975, the High Command of the VPN and the Command of Military Region 5, under the command of General Chu Huy Man, agreed on a plan to seize some Spratlys and other groups of islands. Under their secret plan, the VPN deployed the 126th Battalion, a naval special forces unit of about 170 personnel, to join the Viet Cong 471st Battalion of Military Zone 5. They were supported by three transport ships namely the T673, T674 and T675 along with 60 experienced sailors and technicians from the 125th Naval Transport Brigade. The North Vietnamese operation would commence at 12.00 am on April 9, 1975, to coincide with the North Vietnamese ground attack on Xuân Lộc and to take advantage of low tide to land the special forces on the South Vietnamese-occupied sections of the Spratly Islands. To maintain the secrecy of their operation, the North Vietnamese Navy kept their radio communications to a minimum in the days leading up to the attack.[4]

South Vietnam

Unlike their North Vietnamese counterparts, South Vietnam possessed a large naval force with a strong fleet of ships. Hence the Republic of Vietnam Navy (RVN), commanded by Vice Admiral Chung Tấn Cang, were able to maintain a strong presence in the Spratly Islands, with only a handful of infantry units provided by the ARVN to protect the smaller islands surrounding the main Spratly Island. To defend the islands, ARVN forces were mainly equipped with small infantry weapons, as well as the M-72 anti-tank weapon. Whenever necessary, the RVN could deploy the destroyer Trần Khánh Dư (HQ-04), the frigates Trần Nhật Duật (HQ-03), Lý Thường Kiệt (HQ-16) and RVNS Ngô Quyền (HQ-17), as well as the corvettes Ngọc Hồi (HQ-12) and Vạn Kiếp II (HQ-14) to provide fire support. The RVN also relied on two transport ships, namely the Lam Giang (HQ-402) and Hương Giang (HQ-403), to transport vital supplies and reinforcements to South Vietnamese forces on Spratly Island.[7]


Southwest Cay

On April 9, 1975, three VPN transport ships, disguised as fishing trawlers, began moving towards Southwest Cay in the Spratly Islands with members of the 126th and 471st Battalions all on board. On the morning of April 11, 1975, helicopters from the United States Seventh Fleet began circling the VPN transport ships, but they were allowed to move on as the disguised North Vietnamese ‘fishing trawlers’ were mistakenly identified as ships from Hong Kong. After the American helicopters flew away, the North Vietnamese continued sailing towards Southwest Cay. On the night of April 13, the three ships were closing in on Southwest Cay from three different directions. During the early hours of April 13, 1975, North Vietnamese personnel from the 126th Battalion and the Viet Cong 471st Battalion landed on Southwest Cay using rubber boats.[8]

Taken by complete surprise, the ARVN on Southwest Cay put up stiff resistance, but they surrendered to the North Vietnamese after 30 minutes of fighting. The North Vietnamese claimed to have killed 6 ARVN in action, and taken 33 prisoners.[9] In response to the attack on Southwest Cay, the RVN immediately formed a task force which came in the form of the frigate RVNS Lý Thường Kiệt and the HQ-402 transport ship to retaliate, but both ships were forced to turn back and defend Namyit Island instead. Having achieved their initial objective, the VPN command sent out the transport ship T641, to carry all the captured ARVN soldiers back to Da Nang. With Southwest Cay firmly in their hands, the VPN command set their sights on the next three targets: Namyit, Sin Cowe and Sand Cay.[9][10]

Sand Cay

The VPN, however, were deterred from attacking Namyit Island because they had lost the element of surprise, as well as the strong presence of several RVN frigates surrounding that island. So, instead of attacking Namyit, the North Vietnamese selected Sand Cay as their next target. On the night of April 24, under the observation of the Taiwanese military, VPN transport ships sailed in a single column passed the Taiwanese-occupied island of Itu Aba towards their next objective.[11] Again, following the same pattern of operation, the ships anchored near Sand Cay and prepared for their assault. At 1.30 am on April 25, 1975, three platoons from the 126th Battalion successfully landed on Sand Cay. One hour later, they opened their attack and the ARVN were easily defeated, suffering 2 deaths and 23 captured.[10][11]

The loss of Southwest Cay and Sand Cay, in combination with the defeats suffered by the ARVN on the mainland, placed the RVN in a complex and difficult position. As a result, at 8.45 pm on April 26, 1975, RVN ships in the Spratly Island area were ordered to evacuate the ARVN 371st Local Battalion and withdraw from Namyit and Sin Cowe.[12] While the RVN were preparing to withdraw from Spratly Island, VPN reconnaissance units sent reports back to Hanoi, informing the naval command of RVN ships leaving their positions in Namyit and Sin Cowe. Upon hearing the news of the South Vietnamese withdrawal, the VPN command ordered the 126th Battalion to capture the remaining islands. On April 27 and 28, the PAVN 126th Battalion marched onto Namyit and Sin Cowe without opposition. On April 29, 1975, the North Vietnamese had successfully completed their mission in capturing all of the islands of the Spratly group that had been held by South Vietnam.[10][12][13]

Phú Quý Island

Phú Quý island, also known as Cu Lao Thu, is located off the coast of southern Vietnam. The island is about 60 nautical miles (110 km) away from Phan Thiết, and 82 nautical miles (152 km) away from Cam Ranh Bay. The island is about 21 square kilometers in size, and in 1975 it had a population of about 12,000 people. At the end of March 1975, the ARVN maintained a security team on Phú Quý, which included one police platoon and 4,000 members of the civilian self-defense forces. From April 1975, the local ARVN forces on Phú Quý were joined by an additional 800 ARVN soldiers, who escaped from the mainland town of Hàm Tân when North Vietnamese forces captured it.[14] On April 22, the RVN deployed the HQ-11 corvette and one small patrol boat to defend the island from the North Vietnamese onslaught. On April 26, 1975, the PAVN South Central Coast Command at Cam Ranh Bay and the 125th Naval Transport Brigade of the VPN began transporting members of the 407th Special Forces Battalion from Military Region 5, and elements of the 95th Regiment towards Phú Quý.[14]

At 1.50 am on April 27, 1975, the North Vietnamese landed on the island and the fight for Phú Quý Island began. Caught by surprise South Vietnamese units retreated to the administrative center of the island, where they organized their defenses in an attempt to push back the North Vietnamese forces. While at sea, the RVN's HQ-11 escort ship clashed with boats from the VPN 125th Navy Transport Brigate, but ultimately the long-range artillery used by the VPN proved too much for the HQ-11 and it retreated from the island with significant damage. After several hours of waiting, the commander of the HQ-11 decided to pull anchor and escaped to the Philippines when further reinforcements from the RVN failed to arrive. At 6.30 am remnants of the ARVN gave up and ended their resistance. The North Vietnamese claimed to have captured 382 ARVN prisoners, and collected more than 900 weapons of various kinds.[15][16]

Côn Đảo Archipelago

Côn Đảo archipelago is located in the southwestern area of the South China Sea, nearly 180 kilometers (110 mi) from the city of Vũng Tàu. Côn Sơn Island is the largest island with an area of 52 square kilometers, accounting for about 75% of the entire Côn Đảo archipelago. Côn Sơn is the largest township on the island and was also the seat of the local government. By the end of the Vietnam War, about 7,000 political and military prisoners, of whom 500 were female, were imprisoned at Côn Đảo Prison. On April 29, 1975, the airfield at Côn Sơn became a staging post where South Vietnamese government officials and U.S. advisers were assembled, to be evacuated to the U.S. warships of the 7th Fleet which anchored nearby. During the last days of the war, about 2,000 ARVN soldiers were defending the island.[17][18]

During the early hours of May 1, 1975, all the political prisoners at Prison VII staged an uprising and they quickly overpowered what was left of the South Vietnamese prison authorities. They set up a Provisional Committee to govern the island, and organised three platoon-sized units using captured weapons to march on the remnants of the ARVN. The political prisoners attacked the ARVN barracks at Bình Định Vuong, Camp IV and Camp V. The ARVN chose to run away instead of fighting back, whilst leaving large quantities of weapons and ammunition behind. Encouraged by the news of South Vietnam's capitulation, the prisoners continued their march towards the local police station which had already been abandoned by the South Vietnamese. By 8 am the prisoners had captured all former South Vietnamese infrastructure and assets, including 27 aircraft, as the remaining ARVN soldiers at the Côn Sơn airport also surrendered.[18][19]

On the evening of May 2, 1975, the rebel prisoners on Côn Đảo Island successfully establish communications with North Vietnamese military units. To prepare for the arrival of the North Vietnamese, the Provisional Committee moved to set up a trench system around the island to defend against a possible South Vietnamese or U.S. counter-attack. On the morning of May 5, 1975, the North Vietnamese 171st and 172nd Naval Regiments landed on Côn Đảo Island with elements of the PAVN 3rd Division. Throughout the day regular North Vietnamese military units and the rebel prisoners coordinated their forces, to establish control over the rest of the Côn Đảo Archipelago.[18][20]


After more than two months of planning and combat operations, the VPN successfully captured the Spratly, Phú Quý and Côn Đảo groups of islands from the South Vietnamese. In the days following their victory the North Vietnamese also went on to raise their flag over the smaller cays and reefs of An Bang (Amboyna Cay), Sin Cowe East and Pearson Reef (Hon Sap). In 1976, following the unification of Vietnam, some Spratly islands became a part of Khánh Hòa Province.[10][21]

To assert Vietnam's political sovereignty, the North Vietnamese military initially deployed four battalions of the 2nd Division from Military Region 5 to defend the islands. In September 1975 the North Vietnamese Ministry of Defense transferred the 46th Infantry Regiment from the PAVN 325th Division to the VPN, to form a brigade with the 126th Naval Regiment with the purpose of defending the Spratlys and other groups of islands. Following the establishment of the Socialist Republic of Vietnam in 1976, additional units were transferred to 126th Naval Infantry Brigade to bolster the defenses of Vietnam's outlying islands.[21][22]


  1. ^ Navy High Command, p. 325.
  2. ^ Pham & Khang, pp. 347, 352, 355.
  3. ^ a b Pham & Khang, pp. 348–363.
  4. ^ a b Pham & Khang, pp. 347–347.
  5. ^ a b Dinh, p. 150.
  6. ^ Kenny, p.66.
  7. ^ Dinh, pp. 352–355.
  8. ^ Navy High Command, p. 313.
  9. ^ a b Dinh, p. 162.
  10. ^ a b c d Thayer & Amer, p. 69.
  11. ^ a b Dinh, p. 153.
  12. ^ a b Dinh, p. 155.
  13. ^ Marwyn Samuels (2013). Contest for the South China Sea. Routledge. p. 27.
  14. ^ a b Navy High Command, p. 320.
  15. ^ Dinh, p. 168.
  16. ^ Farrell, p. 66.
  17. ^ The Encyclopedia of Vietnam, p. 557.
  18. ^ a b c Pham, p. 366.
  19. ^ Pham & Khang, pp. 357–358.
  20. ^ Navy High Command, p. 322.
  21. ^ a b Phan, p.19.
  22. ^ Quy, p.17.


  • Dinh, Kinh (2006). History of the 126th Naval Special Forces Group (1966–2006). Hanoi: People's Army Publishing House.
  • Encyclopedia of Vietnam (1995). Part 1. Hanoi: Hanoi Encyclopedia Publishing House.
  • Farrell, Epsey C. (1998). The Socialist Republic of Vietnam and the law of the sea: An analysis of Vietnamese behavior within the emerging international oceans scheme. Cambridge: Kluwer International Law. ISBN 90-411-0473-9.
  • Kenny, Henry J. (2002). Shadow of the Dragon: Vietnam's continuing struggle with China and the implications for U.S. foreign policy. Virginia: Brassey's. ISBN 1-57488-478-6.
  • Navy High Command (2005). History of the Vietnam People's Navy (1955–2005). Hanoi: People's Army Publishing House.
  • Pham, Sherisse (2008). Frommer's Vietnam. New Jersey: Wiley Publishing. ISBN 978-0-470-19407-2.
  • Pham, Thach, N; Khang, Ho (2008). History on War of Resistance Against America (8th edition). Hanoi: People's Army Publishing House.
  • Phan, Thao, V (2007). The Heroic Traditions of Southwest Cay. Hanoi: People's Army Publishing House.
  • Quy, Cao, V (2007). Son Ca Island: Development, Defence and Maturity (1975–2007). Hanoi: People's Army Publishing House.
  • Thayer, Carlyle A.; Amer, Ramses (1999). Vietnamese foreign policy in transition. New York: Institute of Southeast Asian Studies. ISBN 0-312-22884-8.

External links


1975 (MCMLXXV)

was a common year starting on Wednesday of the Gregorian calendar, the 1975th year of the Common Era (CE) and Anno Domini (AD) designations, the 975th year of the 2nd millennium, the 75th year of the 20th century, and the 6th year of the 1970s decade.

It was also declared the International Women's Year by the United Nations and the European Architectural Heritage Year by the Council of Europe.

1975 in the Vietnam War

1975 marked the end of the Vietnam War, sometimes called the Second Indochina War or the American War. The North Vietnamese army (PAVN) launched the Spring Offensive in March, the South Vietnamese army (ARVN) was quickly defeated. The communist North Vietnamese captured Saigon on April 30, accepting the surrender of South Vietnam. In the final days of the war, the United States, which had supported South Vietnam for many years, carried out an emergency evacuation of its civilian and military personnel and more than 130,000 Vietnamese.

At the beginning of the Spring Offensive the balance of forces in Vietnam was approximately as follows; North Vietnam: 305,000 soldiers, 600 armored vehicles, and 490 heavy artillery pieces in South Vietnam and South Vietnam: 1.0 million soldiers, 1,200 to 1,400 tanks, and more than 1,000 pieces of heavy artillery.The capital city of Cambodia, Phnom Penh, was captured by the Khmer Rouge on April 17. On December 2 the Pathet Lao took over the government of Laos, thus completing the communist conquest of the three Indochinese countries.

East Sea

East Sea or Eastern Sea may refer to:

East China Sea, a marginal sea east of China, where it is called Dōnghǎi (东海/東海) in Chinese, meaning "East Sea"

East Sea (Chinese literature), one of the Four Seas, a literary name for the boundaries of China

South China Sea, a marginal sea south of China and east and south of Indochina, called Biển Đông in Vietnamese, meaning "East Sea"

Sea of Japan, a marginal sea between the Korean Peninsula, Russia and the Japanese archipelago, called Donghae (Hangul: 동해; Hanja: 東海; East Sea) in South Korea, and Chosŏn Tonghae (Hangul: 조선동해; Hanja: 朝鮮東海; Korean East Sea) in North Korea.

Sea of Japan naming dispute

Baltic Sea, called "East Sea" in various languages

Dead Sea, a salt lake east of Israel, as used in the Bible (Joel 2:20; Ezek. 47:18)

Mare Orientale, Latin for "Eastern Sea", on the Moon

Atlantic Ocean, also referred to as the East Sea or Eastern Sea in poetry and other uses in North America

Pacific Ocean, called the East Sea in poetry and other uses from Australia, New Zealand, China and Japan

Indian Ocean, earlier called the "Eastern Ocean" or "Eastern Sea"

Eastern Sea, the eastern ocean of Middle-earth in J. R. R. Tolkien's fiction

Timeline of Vietnamese history

This is a timeline of Vietnamese history, comprising important legal and territorial changes and political events in Vietnam and its predecessor states. To read about the background to these events, see History of Vietnam.

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