Despite his short time as ruler, King Wu played a part in Qin's wars of unification, mainly through his efforts against the state of Han. He also invaded some of the other major powers of the Warring States, especially Wei. In his fourth year, his minister Gan Mao (甘茂), suggested an attack on the Han fortress of Yiyang to open up a path to invade the eastern powers. The campaign succeeded and Qin subsequently gained control of the key roads to the Zhou capital of Luoyang.