This engagement took place between September and November 1948, lasting a total of 52 days. The campaign ended after the Nationalist forces suffered sweeping defeats across Manchuria, losing major cities of Jinzhou, Changchun and eventually Shenyang in the process, eventually leading to the capture of the whole of Manchuria by the Communist forces. The victory of the campaign resulted in the Communists achieving strategic numerical advantage over the Nationalists for the first time in its history.

By spring 1948, the Communist forces were in control of the countryside across Northeast China, isolating the Nationalist forces in Shenyang, Changchun and Jinzhou from each other. In addition, the PLA had seized control of the Jingha Railway, cutting off the Nationalist land route supply lines to Shenyang and Changchun. Consequently, supplies for the Nationalist forces in the Northeast had to be airlifted, which were largely ineffective and unsustainable.

Jinzhou was a "key point" in the Liaoxi Corridor, the principal land passage from Manchuria to North China Plain. On 12 September 1948, the Northeast Field Army headed south and launched a series of attacks along the Beining Railway. Between 12 September to 28 September, the Communist forces maneuvered to cut off Nationalist supply line from Qinhuangdao to Jinzhou. By 28 September, they had captured Suizhong, Changli, Tashan and Yixian, controlling the area between Jinzhou and Qinhuangdao, effectively isolating Jinzhou.

Chiang Kai-shek arrived in Beijing on 30 September and held a military conference with Fu Zuoyi. The Nationalists assembled the 39th, 62nd and 92nd Army led by Hou Jingru to reinforce Jinzhou as part of the "East-Advancing Army Corps", with the objective to fortify Nationalist positions in Huludao. On 2 October, Chiang flew to Shenyang to discuss the formation of the "West-Advancing Army Corps" with Wei Lihuang, and ordered Liao Yaoxiang to reinforce Jinzhou with the 9th Army from the west to break the encirclement attempt of Jinzhou by the CCP. With the new developments in Nationalist strategies, Lin Biao was initially hesitant to continue with Communist offensive against Jinzhou, but he was convinced to carry on with the assault by Mao Zedong.

By 8 October, the Northeast Field Army have amassed 250,000 troops and completed the encirclement of Jinzhou. Between 10 and 15 October, the Nationalist reinforcements for Jinzhou from both the west and the east were closing in on the Communists, but they were decisively stopped in Tashan. The final assault on Jinzhou began on 14 October. The city was captured in the next evening, along with the Nationalist commander Fan Hanjie and 80,000 Nationalist troops.

Changchun had been encircled for more than five months prior to the campaign. Already weakened by starvation since February 1948, civilians were fleeing Changchun in large numbers on daily basis by June 1948. Many refugees were unable to pass through the Communist blockade, and unable to return as the Nationalist defenders blocks refugees from returning to the city. The Nationalist garrison were unable to break out of the city despite the order from Chiang. Following the fall of Jinzhou, the Nationalist 60th Army stationed in the east side of the city defected to the Communist side on 17 October. Following their defection, the Nationalist New 7th Army agreed to the terms of surrender on 19 October. The remaining Nationalist forces in Changchun surrendered the city to the PLA on 23 October, and Nationalist commander Zheng Dongguo became a prisoner of war.

After the Nationalist forces suffered heavy losses in Jinzhou and Changchun, Chiang Kai-shek intended to stage a counteroffensive and quickly recapture Jinzhou. He ordered Liao Yaoxiang and the Ninth Army Group which had been advancing from Shenyang to continue marching west and attack Jinzhou. However, Liao and other senior Nationalist officers contested this decision. On 16 October, the Nationalist high command reached a consensus and decided to attack Heishan and Dahushan instead, covering their withdrawal to Yingkou in the process. The decision was approved by Chiang, and on 21 October the Ninth Army Group launched an attack on Heishan.

The Communist forces successfully defended Heishan and Dahushan, and the Nationalist forces were unable to make any progress. The Ninth Army Group was subsequently encircled by the main forces of the PLA and decisively defeated. Over 25,000 Nationalist soldiers had been killed in action, and Liao Yaoxiang was captured by the PLA.

After the Ninth Army Group was destroyed, the Northeast Field Army began to encircle Shenyang on 29 October. As the city fell into disarray, the Nationalist's Eighth Army Group collapsed as the commander Wei Lihuang fled from Shenyang by plane on 30 October. The Communist forces launched the final assault on Shenyang the next morning on 1 November against the Nationalist garrison of 140,000 men, which quickly surrendered soon after. On 2 November, Yingkou was also captured by the Communist forces, with the Nationalist 52nd Army narrowly retreating by ship. The remainder of the Nationalist forces, mostly from the West Army, managed to preserve some of their strength as they withdrew from Huludao to Tianjin. With the Northeast being completely clear of the Nationalist forces, the Liaoshen campaign effectively came to its conclusion.

This battle is one featured in a Chinese TV Series entitled, Decisive Engagement, which focuses on the three major campaigns in the War of Liberation: Liao-Shen Campaign, Huai-Hai Campaign, and Ping-Jin Campaign. The epic campaigns show the magnificent decisive engagement for China's destiny.