sentences:  The communist III Corps and the 47th Army then turned their attention to the nationalist XV Corps and the XX Corps retreated to the region north of Nanchuan (南川) County by respectively crossing the Black River (Wu Jiang, 乌江) at regions including Gong's Beaches (Gong Tan, 龚滩), White Horse (Bai Ma, 白马), Tukan (土坎), and north of Peng's Waters (Peng Shui, 彭水).The major escape route to Qijiang (綦江) in the west for the nationalists were severed.Chiang Kai-shek in Chongqing had realized the enemy's intention of besieging Chengdu and Chongqing by striking behind the nationalist line from western Hunan and western Hubei via Sichuan and Guizhou, and thus immediately ordered Hu Zongnan to conclude Qinling Campaign by withdrawing from the Qinling defensive line, and enter Sichuan from Qinling and Greater Ba Mountain (Da Ba Shan, 大巴山) to avoid being isolated and surrounded by the enemy.