From
毛泽东 《七律·人民解放军占领南京》 (April 1949, after PLA forces captured Nanjing):
宜将剩勇追穷寇,
不可沽名学霸王 (Use remaining courage to chase the beaten enemy; do not seek empty fame like the Hegemon-King).
霸王 =
项羽, who famously let
刘邦 escape at
鸿门宴 rather than kill an unarmed guest, losing the empire. Mao argues: do not repeat Xiang Yu's chivalrous mistake; press the KMT to total defeat.