Answer:
The Zhou coexisted with the Shang dynasty (c. 1600–1046 bce) for many years, living just west of the Shang territory in what is now Shaanxi province. At various times they were a friendly tributary state to the Shang, alternatively warring with them. One of the Zhou ruling houses devised a plan to conquer the Shang, and a decisive battle was fought, probably in the mid-11th century bce.