A number of biographical studies of individual warlords have appeared since the 1960's. One example among many is James E. Sheridan, Chinese Warlord: The Career of Feng Yü-hsiang (Stanford, CA: Stanford University Press, 1966). For the view from below, see Diana Lary, Warlord Soldiers: Chinese Common Soldiers, 1911-1937 (Cambridge: Cambridge University Press, 1985). Hsi-sheng Ch'i, Warlord Politics in China, 1916-1928 (Stanford, CA: Stanford University Press) is an overview that includes several chapters on military capabilities. The only in-depth study of a warlord war (in this case the Second Zhili-Fengtian War of 1924) is Arthur Waldron, From War to Nationalism: China's Turning Point (Cambridge: Cambridge University Press, 1995).