The Zhou–Chu War was a military conflict between the Zhou dynasty under King Zhao and the state of Chu from 961 to 957 BC. King Zhao personally led at least two major campaigns against Chu and other states and tribes of the middle Yangtze region, initially conquering the lands north of the Yangtze and the Han River valley. Eventually, however, the Zhou forces suffered a crushing defeat, with half of their armed forces as well as King Zhao killed, subsequently losing control of much conquered territory. The war ended the era of Western Zhou’s early expansion and forced it into the defense against foreign aggressors. On the other side, Chu consolidated its de facto independence and would continue to grow into one of the most powerful states of China.