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In -685, Spring and Autumn period: Battle of Qianshi: Upon the death of the previous Duke of Qi, Gongsun Wuzhi, Duke Zhuang of Lu sends an army into the Duchy of Qi to install the exiled Qi prince Gongzi Jiu as the new Duke of Qi – but is defeated at Qianshi by Jiu's brother and rival claimant, the newly inaugurated Duke Huan of Qi. This featured entry focuses on the immediate decision and its direct historical impact.
