 The struggle for control of Shangdang triggered direct conflicts between Qin and Zhao, then the two largest military powers among the warring states, leading to the devastating Battle of Changping.In 256 BC, a Qin general named Jiu (摎) attacked Han, killing 40,000 of the enemy and capturing Yangcheng (陽城) and Fushu (負黍).Two years later in 254 BC, Jiu attacked Wei and captured Wucheng (吳城), forcing Wei to submit to Qin as a vassal state.