sentences:  Lin Biao and Mao Zedong had personally inspected communist fortifications at important defensive positions such as Pagoda Mountain (Ta Zi Shan, 塔子山) and Three Lines of Groves (San Dao Lin Zi, 三道林子) with Peng Zhen in preparation for a prolonged campaign.Lin Biao also held a conference at Pear Tree (Li Shu, 梨树) county to plan the strategy of the defense