Battle of Changping
Lord Pingyuan was celebrated for his role in lifting Qin's siege of the Zhao capital Handan, thus saving Zhao from annihilation. However, his chancellorship also saw the crushing defeat of Zhao by Qin at the Battle of Changping, which led to the siege. As with the rest of the Four Lords, his generosity to his retainers is considered a major part of his political and diplomatic accomplishments.