According to the best American intelligence estimate, the Chinese Communists had about 116,000 regular troops in Manchuria on 8 July, 217,000 on 8 August, 246,000 on 30 August, and, by 21 September, transfers from southern and central China had augmented the Manchurian garrisons to an estimated 450,000 men.
Many of these troops belonged to Communist General Lin Piao's Fourth Field Army, which was normally stationed in Manchuria, but which
had been transferred south to participate in operations against Hainan and
Formosa, and, following the postponement of this aggression, might merely be
returning to its home stations.#8
#8 efc INTSUM No. 3006, 2 Dec. 1950.