Lian Po
Unable to break the stalemate, Qin began using spies stationed within Zhao to spread rumours about Lian Po being old, cowardly and incompetent. King Xiaocheng believed the rumours, and decided to dismiss Lian Po and replace him with Zhao Kuo (趙括), the son of the late Zhao She, despite objections from chancellor Lin Xiangru and Zhao Kuo's own mother. Zhao Kuo, an arrogant young man with great philosophical knowledge of military strategies but no real combat experience, immediately reversed all of Lian Po's strategic arrangements upon arriving at the frontline. He led the Zhao army away from the protection of Lian Po's defensive structures, and sought to actively engage Qin in pitched battles.