sentences:  On September 11, 1946, the communists launched a counteroffensive on the nationalist reinforcement retreating toward Crouching Dragon Mountain (Wo Long Shan, 卧龙山) and Head Bad Mountain (Nao Bao Shan, 脑包山), badly mauling the nationalist 11th Division and the 17th Division, killing more than 5,000 nationalist troops.On September 12, 1946, the nationalist 101st Division followed by the Newly Organized 32nd Division and the Newly Organized 4th Cavalry Division came to take Jining in full force.By September 13, 1946, the nationalist reinforcement reached Jining and begun their attack on the city, and the communists were forced to abandon the city in the evening on the same day.