On 12 December 1979 , Chun ordered the arrest of Army Chief of Staff Jeong Seung-hwa on charges of conspiring with Kim Jae-kyu to assassinate the President .
On 12 December 1979 , in what became known as the Incident of December 12th , Chun ordered the arrest of Army Chief of Staff General Chung Sung Hwa ( 정승화 , 鄭昇和 ) without authorization from then-President Choi Kyu-ha .