9th Army Group, with Lu Fei as its commander and Chen Shifu as the political commissar. Its three divisions were renamed as 58th, 59th, 60th Infantry Divisions. Right after the reform, the 20th Army took part in the battle of Yangtze Crossing, and Battle of Shanghai. After the Civil War, the 20th was stationed in the Jiangsu and Zhejiang areas and prepared for the invasion of Taiwan as a reserve formation. After the Korean War broke out, the 20th Army entered Korea in November 1950 as part of the Chinese People's Volunteers, and returned to China in October 1952. It was one of the first PLA armies to return, and was located in the Chekiang area. The 20th Army consisted of the 58th, 59th, 60th Divisions and 89th Divisions, though the 89th Division was attached to the 20th Army from its parent unit, the 30th Army. Elements of the 20th also took part in the 1979 Sino-Vietnam war. In 1985 the 59th Division was disbanded. In May 1989, the 20th Army's 58th and 128th Infantry Divisions were deployed to Beijing to enforce martial law and suppress the Tiananmen Square protests of 1989. In 1996 it appears that the 128th Infantry Division was transferred to the People's Armed Police. In 1998, the 60th infantry division was reorganised as a motorised infantry brigade. Current The formation remains active as part of the Jinan Military Region, as one of the new "all brigade" Group Armies. Circa 2006 its headquarters was located at Kaifeng in Henan, and its subordinate units include the 58th Mechanized Infantry Brigade (Xuchang, Henan), the 60th Motorized Infantry Brigade (Minggang, Xinyang, Henan), an anti-aircraft brigade (Shangqiu, Henan), an armoured brigade (Nanyang), an artillery Brigade (Queshan), and an engineer regiment (Xinyang). Unit 71315, an unidentified AAA Brigade, conducted live-fire exercises during the late autumn of 2002. The unit deployed from its normal location via train moved to its assigned operating location and conducted the exercises, defending against enemy aircraft and aerial surveillance. The exercise lasted roughly thirty-six hours and specifically tested two battalions. References Field armies of the People's Volunteer Army Field armies of the People's Liberation Army Military units and formations established in 1949 Jinan Military Region