December 12 Incident
Also called: Coup d’état of December Twelfth
On 12 December 1979 Chun Doo-hwan, Roh Tae-woo and the "new military" group forcibly detained the martial-law commander and took control of the army.
On 12 December 1979 Chun Doo-hwan — Defense Security Commander and head of the joint investigation into 26 October — together with Roh Tae-woo and other officers detained their superior, Army Chief of Staff and martial-law commander Jeong Seung-hwa, without presidential approval, and seized control of the military.
In 1997 the Supreme Court ruled the incident a military rebellion.