Battle of Changping
In 270 BCE, Qin invaded Han and threatened crucial Zhao interests in central China, especially with regards to the Shangdang region (present-day southern Shanxi). King Huiwen sent forces to intervene; under the leadership of Zhao She the Qin forces were defeated. This minor skirmish enhanced Zhao prestige, but was to foreshadow a greater Zhao-Qin rivalry that would end disastrously for the former at the Battle of Changping a decade later.