By August 1925 the Fengtian Army controlled four large provinces within the Great Wall (Zhili—where Beijing was located, but not Beijing itself—Shandong, Jiangsu and Anhui). One unit even marched as far south as the city of Shanghai. However, the military situation was so unstable that Sun Chuanfang, a Zhili clique warlord whose sphere of influence extended along the Yangtze, managed to push back the Fengtian Army again. By November, Zhang held only a small corner of north China, including a corridor connecting Beijing with Manchuria. Attacks on Beijing continued into the spring of 1926.