唐朝时，有一位名叫郭子仪的将军，他武功高强，智谋过人，在安史之乱中立下了赫赫战功，是唐朝中后期的一位重要将领。一次，郭子仪率领大军出征，准备攻打叛军。他命令士兵在城外挖掘战壕，并在壕沟中放置了许多陷阱。第二天，叛军来犯，郭子仪命令士兵们躲在战壕中，等待时机。叛军冲锋陷阵，以为可以轻易取胜，结果却被郭子仪的士兵打得落花流水，溃不成军。他们损失惨重，只能狼狈逃窜。郭子仪趁胜追击，最终将叛军彻底消灭。然而，郭子仪的成功并非一蹴而就，他曾经也经历过失败。在一次战役中，郭子仪率领的军队遭遇了敌军的伏击，结果损失惨重，几乎全军覆没。郭子仪被俘，险些丧命。这次失败，令郭子仪深受打击，但他并没有因此一蹶不振。他吸取了失败的教训，痛定思痛，总结经验，重新振作起来，最终取得了胜利。
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