Only two years after assuming power, King Wu died and left the kingdom to his young son King Cheng. The Duke of Zhou successfully attained the regency and administered the kingdom himself, leading to revolts not only from disgruntled Shang partisans but also from his own relatives, particularly his older brother Guan Shu. Within five years, the Duke of Zhou had managed to defeat the Three Guards and other rebellions and his armies pushed east, bringing more land under Zhou control.