Although more stable than northern China as a whole, southern China was also torn apart by warfare. Wu quarreled with its neighbours, a trend that continued as Wu was replaced with Southern Tang. In the 940s Min and Chu underwent internal crises which Southern Tang handily took advantage of, destroying Min in 945 and Chu in 951. Remnants of Min and Chu, however, survived in the form of Qingyuan Jiedushi and Wuping Jiedushi for many years after. With this, Southern Tang became the undisputedly most powerful regime in southern China. However, it was unable to defeat incursions by the Later Zhou between 956 and 958, and ceded all of its land north of the Yangtze River.