The 12 December 1979 seizure in which Chun Doo-hwan's Hanahoe arrested the army chief -- a Korean coup that led toward 17 May 1980 and Gwangju.
Educational history. Casualty figures are documented ranges. This is not operational advice, a ranking of nations, or a how-to for weapons or coups.
On the night of 12 December 1979, Major General Chun Doo-hwan -- head of the Defense Security Command and of the secret officers' club Hanahoe -- moved troops in Seoul and arrested General Jeong Seung-hwa, the Army Chief of Staff. President Park Chung-hee had been assassinated on 26 October by Kim Jae-gyu. Acting president Choi Kyu-hah's government was already weak. 12.12 was a coup inside the army that captured the centre of the ROK military.
Shooting in the capital that night was limited compared with a civil war; the political violence of the sequel was not. On 17 May 1980 Chun's circle expanded martial control; the Gwangju Uprising (18-27 May) was crushed with a death toll in the hundreds in official figures and higher in civic memory. The 12 December night is the necessary preface to May.
English-language memory of 1979-80 Korea is thin beside Kwangju's later human-rights file. For Korean readers this is a core civic wound: Hanahoe, the "new military," and the long road to the June 1987 democratic struggle. This page is political-military history -- named units and dates -- not a guide to moving battalions through Seoul.
Deep introduction
12.12 was a factional seizure of the ROK Army that became a regime -- and then a democracy movement's origin story.
Kim Jae-gyu killed Park at a dinner on 26 October 1979. Jeong Seung-hwa, as Army Chief, took charge of the investigation. Chun, as DSC commander, was both investigator and ambitious faction leader -- a conflict of roles.
Choi Kyu-hah was a transitional civilian face without a secure gun.
Hanahoe officers moved the 9th Division and other trusted units. Jeong was seized. Some loyalist resistance occurred at Army HQ. US Forces Korea was informed after the fact -- a still-argued alliance wrinkle, not a US-run coup.
This paragraph dates a past insubordination. It does not teach one.
The "new military" widened control in May 1980, closed politics, and sent troops to Gwangju. The civic dead of 18-27 May are the moral centre of the 1979-80 file for most Koreans.
Chun became president; Roh Tae-woo, another Hanahoe general, followed -- a decade of the 12.12 cohort.
The June Democratic Struggle forced a direct presidential election. Later trials (1995-96) convicted Chun and Roh for 12.12 and Gwangju -- a legal afterlife rare among this atlas's coups.
Films (12.12: The Day, A Taxi Driver) recast the English-available memory in the 2010s-20s.
Dated history of 12 December 1979 coup (12 December 1979 (night of the seizure; 17 May 1980 and Gwangju follow)) in Seoul: Army HQ, Hanahoe networks, after Park Chung-hee's assassination.
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02Historical forces and institutions of 12 December 1979 coup -- not a live order of battle.
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03How 12 December 1979 coup unfolded as historical sequence, not instruction.
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04Human and material cost of 12 December 1979 coup, as documented ranges.
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05People and debates around 12 December 1979 coup.
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06Afterlives and unresolved questions of 12 December 1979 coup.
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07Maps, portrayals and rituals of 12 December 1979 coup.
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