《资治通鉴·魏纪·魏纪四》
于是派遣征蜀护军秦朗统率步、骑兵二万人援助事马懿抵御诸葛亮，命令司马懿： 一定要坚守壁垒，不与决战，挫败敌军锋芒，使们们进攻不能得逞，撤退不能交战，停留时间长久，粮食就要耗尽，劫掠也不会有收获，则必撤军。待敌撤退时再去追击，才是全胜之道。 
乃使征蜀护军秦朗督步骑二万助司马懿御诸葛亮，敕懿： 但坚壁拒守以挫其锋，彼进不得志，退无与战，久停则粮尽，虏略无所获，则必走；走而追之，全胜之道也。 
He therefore sent the Protector-General of the Shu Campaign, Qin Lang, to lead an army of twenty thousand infantry and cavalry to reinforce Sima Yi in resisting Zhuge Liang, and ordered him: Be sure to hold fast to your positions and avoid decisive battles. Frustrate the enemy’s attempts to advance; make it impossible for them to withdraw; and wait until their time grows long, their provisions run out, and they have nothing left to plunder, so that they necessarily retreat. When the enemy retreats, pursue them and then you will have achieved total victory. 
<s>[INST] 请提供这段文言文的现代汉语解释: 乃使征蜀护军秦朗督步骑二万助司马懿御诸葛亮，敕懿： 但坚壁拒守以挫其锋，彼进不得志，退无与战，久停则粮尽，虏略无所获，则必走；走而追之，全胜之道也。  [/INST] 于是派遣征蜀护军秦朗统率步、骑兵二万人援助事马懿抵御诸葛亮，命令司马懿： 一定要坚守壁垒，不与决战，挫败敌军锋芒，使们们进攻不能得逞，撤退不能交战，停留时间长久，粮食就要耗尽，劫掠也不会有收获，则必撤军。待敌撤退时再去追击，才是全胜之道。 </s>
请提供这段文言文的现代汉语解释: 乃使征蜀护军秦朗督步骑二万助司马懿御诸葛亮，敕懿： 但坚壁拒守以挫其锋，彼进不得志，退无与战，久停则粮尽，虏略无所获，则必走；走而追之，全胜之道也。
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于是派遣征蜀护军秦朗统率步、骑兵二万人援助事马懿抵御诸葛亮，命令司马懿： 一定要坚守壁垒，不与决战，挫败敌军锋芒，使们们进攻不能得逞，撤退不能交战，停留时间长久，粮食就要耗尽，劫掠也不会有收获，则必撤军。待敌撤退时再去追击，才是全胜之道。
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