 The state of Qin actually did not share any borders with the state of Qi, but they nevertheless clashed with each other due to the complicated "zong-heng" diplomacy during the Warring States period.In 299 BC, King Zhaoxiang invited Lord Mengchang to Qin with the intention of appointing him as chancellor.However, after hearing (perhaps ill-intended) warnings from his ministers that Lord Mengchang was still loyal to his home state of Qi (which had just soured its diplomatic relationship with Qin), King Zhaoxiang ordered Lord Mengchang to be put under house arrest.