话说三国时期，诸葛亮率领蜀军北伐，与曹军在渭水之畔展开激烈的对峙。曹军占据地利，兵力雄厚，蜀军处于劣势。诸葛亮深知硬拼难以取胜，便决定采取策略，相机而动。他暗中派人观察曹军的动向，并仔细分析地形地势。经过一段时间的观察，诸葛亮发现曹军主帅司马懿性格谨慎，多疑善变，常常因为一些小事而犹豫不决。诸葛亮抓住这个弱点，故意示弱，营造蜀军士气低落，准备撤兵的假象。司马懿果然上当，放松警惕，下令追击蜀军。诸葛亮早就预料到司马懿的举动，在预设的埋伏地点设下陷阱，待曹军进入伏击圈后，蜀军突然发起猛攻，大败曹军。这场战役以蜀军大胜告终，充分体现了诸葛亮“相机而动”的智慧。
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