sentences:  By mid November 1949, one of the communist attacks on the nationalist XIV Corps and XX Corps had succeeded in breaching the nationalist defense on both flanks, resulting in Youyang (酉阳), Xiushan and Enshi falling into the enemy hands.By November 21, 1949, 4 divisions of the nationalist XIV Corps in the regions to the east of Salty Abundance (Xian Feng, 咸丰) in Hubei were completely annihilated by the enemy.The remaining nationalists was forced to retreat westward by crossing the Black River (Wu Jiang, 乌江).