Coup Atlas Research Database
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73212121979SuccessfulMilitary coup

Republic of Korea, 1979 — military coup

Republic of Korea (KOR)East Asia, AsiaDecember 12, 1979

Event Summary

On the night of December 12, 1979, General Chun Doo-hwan led a group of military investigators and loyalist officers, including General Roh Tae-woo, in arresting General Chung Seung-hwa, the martial law commander and army chief of staff who held significant governmental power following President Park Chung-hee's assassination. Chung was accused of complicity in Park's assassination; when troops loyal to Chung tried to intervene, a gun battle broke out in which several soldiers were killed, and Roh ordered troops from the DMZ into Seoul to reinforce Chun's faction. Chun's group prevailed, seizing control of the South Korean military establishment and sidelining Chung, who was later court-martialed and sentenced to 10 years in prison (he was exonerated by a Seoul court in 1997).

The coup, known as the 'Twelve-Twelve Incident' (12.12), consolidated power in the hands of Chun and his allied younger officers and set the stage for Chun's move to seize civilian control of the government in mid-1980, a chain of events that culminated in the Gwangju uprising and its violent suppression.

Researched Details

Researched

Independent research, added record by record. Hover any label for what it means.

Target identified in Coup Atlas research: General Chung Seung-hwa, Army Chief of Staff and Martial Law Commander
RESEARCHED NAME
Key figures
Chun Doo-hwan
Chung Seung-hwa
Roh Tae-woo

Sources

As army chief of staff and martial law commander after Park Chung-hee's assassination, Chung Seung-hwa held significant governmental power in South Korea in late 1979.
SOURCE REVIEWED Chung Seung-Hwa | South Korean General, Biography, & Facts | Britannica (Encyclopaedia Britannica) open source ↗
On December 12, 1979, Chung Seung-hwa was involved in a shootout with a group of military investigators led by General Chun Doo-hwan, who then arrested him.
SOURCE REVIEWED Chung Seung-Hwa | South Korean General, Biography, & Facts | Britannica (Encyclopaedia Britannica) open source ↗
General Chun Doo-hwan, chief of the army's security command, arrested Chung on the stated grounds that Chung was complicit in the assassination of President Park; a military court later sentenced Chung to 10 years in prison for allegedly failing to arrest the assassin quickly enough and having prior knowledge of the plot.
SOURCE REVIEWED Chung Seung-Hwa | South Korean General, Biography, & Facts | Britannica (Encyclopaedia Britannica) open source ↗
A Seoul court exonerated Chung Seung-hwa in 1997, restoring his military status and benefits.
SOURCE REVIEWED Chung Seung-Hwa | South Korean General, Biography, & Facts | Britannica (Encyclopaedia Britannica) open source ↗
Chun Doo-hwan led the coup with support from General Roh Tae-woo and officers of the 1955 Korean Military Academy graduating class; on the night of December 12, 1979 Chun arrested martial law commander Chung Seung-hwa, and when loyal troops came to Chung's aid a gun battle broke out killing some soldiers, while Roh ordered DMZ troops into Seoul to back Chun's forces.
SOURCE REVIEWED General Chun Doo-hwan took power in a coup - The Korea Times open source ↗
The 12.12 incident marked the first step in Chun's phased assumption of power, a chain of events that culminated in Chun's takeover of the civilian government in May 1980 and the subsequent Gwangju uprising, whose final death toll was over two hundred.
SOURCE REVIEWED General Chun Doo-hwan took power in a coup - The Korea Times open source ↗
Chun Doo-hwan is described by Britannica as having helped lead the 1979 coup that overthrew the government.
SOURCE REVIEWED Chun Doo-Hwan | Biography & Facts | Britannica (Encyclopaedia Britannica) open source ↗

Editorial Note

Sources consistently identify Chung Seung-hwa (martial law commander/army chief of staff) as the target arrested by Chun Doo-hwan's faction on 12/12/1979. Some secondary framing (e.g., Wikipedia, not independently verified here) also treats the broader civilian government/President Choi Kyu-hah as ultimately affected, but Britannica and Korea Times sources center the arrest and power struggle on Chung Seung-hwa specifically. Facts were confirmed directly against Britannica and Korea Times pages fetched this session rather than via Wikipedia footnote-chasing. | Downgrades/corrections made: (1) Facts 1 and 6 had "quote" fields that were invented/synthesized text not actually appearing verbatim on the cited pages (fact 6 used ellipses to stitch together non-contiguous paraphrased language, including the invented phrase "triggered a chain of events culminating in" which does not appear in the source). Both facts' underlying claims remain independently verified against the real page content, so I replaced the quote fields with genuine excerpts rather than removing the facts. (2) The summary's claim that Chun Doo-hwan was "chief of the Army Security Command" is not supported by any fact in the entry's own source list — my direct fetch of the cited Britannica Chun Doo-hwan page did not surface this detail (only a general "helped lead the 1979 coup" line was found). I could only corroborate the Army/Defense Security Command title via an outside Wikipedia check not present in this entry's sourcing, so per the strict standard I trimmed it from the summary rather than backfill with an uncited claim. Also trimmed unsupported "Major General" rank specificity for Chun and Roh in the summary, since the cited quotes only use "Gen." / "General," not "Major General." All three source URLs (Britannica x2, Korea Times) were confirmed live and on-topic; no dead links, no wholesale fabrications found.

How It Unfolded

Hand-coded by Coup Atlas from the sources on this page, using a fixed list of tactics. Only events we have read through carry this coding, so most records do not have it yet.

Led by
Military
How long it took
Under a day — resolved within 24 hours
  • Troop movements in the capital or key cities
  • Mass arrests of officials, officers, or opponents

Cross-Reference

Only one dataset carries it. One of the three reference datasets we check against carries this event; the others do not list it. That is not a contradiction — the datasets cover different periods and use different thresholds — but it means the record has had less outside corroboration.

Identifiers for finding this same event in the other datasets:

Cline Center id
73212121979

How the match is made is described in crossref-report.md.

Outcome and Target

Coup Atlas research identifies the target as: General Chung Seung-hwa, Army Chief of Staff and Martial Law Commander.

Baseline coding: Incumbent executive removed from power. Recorded leader fate: deposed; injured; arrested or jailed. The baseline file does not name individual targets; researched names are kept in a separate layer.

Baseline Dataset Citation
Cline Center Coup d’État Project Dataset, v2.2.2
Peyton, Buddy, Joseph Bajjalieh, Michael Martin, and Andrea Gerald. 2026. Cline Center Coup d’État Project Dataset. Cline Center for Advanced Social Research. V.2.2.2. February 17. University of Illinois Urbana-Champaign. doi: 10.13012/B2IDB-9651987_V10
Open dataset DOI ↗
⚑ This citation establishes the coded baseline record; use the claim-level sources above for the researched narrative.

Baseline Source-Document Entries

CSP

Named in the baseline source document; no article citation was recorded.

Wikipedia

en.wikipedia.org/wiki/Coup_d%27%C3%A9tat_of_December_Twelfth

New York Times

“Korean Army Ruler Seized in Park CaseAfter a Gun Battle,” December 13, 1979
“7 Top generals are Held in Seoul; Military power Struggle is Seen,” by Henry Scott Stokes, December 14, 1979
“Korean General Filling Key Posts With His Men To Bolster Power,”by henry scott stokes, December 15, 1979
“Korea Sentences 7 to Die for Murder of President Park,” by Henry Scott Stokes, December 20, 1979
“Seoul Politics: Military’s Role,” by Henry Scott Stokes, March 17, 1980
“New Intelligence Chief is Now South Korea’s Strong Men,” by Henry Scott Stokes, April 16, 1980
“Chun Formally Picked as President in One-Candidate Election in Seoul,” by Henry Scott Stokes, August 27, 1980
“5 Believed Dead in Clashes in Southern Korean City,” May 20, 1980
“Protestors Control South Korean City; At Least 32 Killed,” by Shim Jae Hoon, May 22, 1980
“South Korean Troops Recapture Kuwangju in Predawn Strike,” by Henry Kamm, May 27, 1980
“South Korean General Forms a Parallel Government,” by Henry Scott Stokes, June 5, 1980
“President Resigns In South Korea To Make Way For Army Strongman,”by henry scott stokes, August 16, 1980
“Chun Supporters Sweep Seoul assembly Election,” March 26, 1981
“South Korean President Says he will serve only one term,” August 24, 1983
“South Korea Chief Says he Never sought Power,” by Clyde Haberman, January 30, 1988

This is the citation trail carried by the baseline dataset, grouped by outlet and rejoined from the line-wrapped original. Coup Atlas has not independently re-checked every document; read the original before citing a specific claim. URLs the import damaged beyond safe repair are shown as plain text and listed in citations-report.md. How this list is built →

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