Battle of Jinyang
... that the Fen River was used to flood the city of modern-day Taiyuan in the Battle of Jinyang, and was later used to defeat the besieging army?
... that the <a href="./Fen_River" id="mwEoo" rel="mw:WikiLink" title="Fen River">Fen River</a> was used to flood the city of modern-day <a href="./Taiyuan" id="mwEos" rel="mw:WikiLink" title="Taiyuan">Taiyuan</a> in the <b id="mwEow"><a href="./Battle_of_Jinyang" id="mwEo0" rel="mw:WikiLink" title="Battle of Jinyang">Battle of Jinyang</a></b>, and was later used to defeat the besieging army?