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第405章 【直道和驰道】

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魏延听贾诩这么一说,顿时想起以往刮风下雨天气行军的艰辛缓慢。最新地址ltxsba.xyz

虽然这次出兵河套,一路都是好天气,没有遇到雨雪,泥土干燥,骑马疾驰,还能跑得起来,可援救不只是骑兵救援,要先守得住城池立于不败之地才能追求更大的胜利,精锐步兵的驰援速度要保证得住,那就要动用马车,当然,更重要的是后方的辎重粮草军械要供给及时,这些都必须要用马车载重,所以若想保证河套地区关隘城池稳固,把河套变成自己征战四方的坚固后方和稳固粮仓,就必须通往河套的道路能够顺遂地通行马车。

魏延皱起眉头,问道:“文和,你有何策解决这个问题?”

贾诩明白魏延想要的答案不是一个简单的回答“修路啊”,而是怎么修。

贾诩早已胸有成竹,不假思索道:“主公,不如我们重修秦直道?”

魏延有些没反应过来:“直道?”

贾诩指着那条从青岩山谷穿行的道路:“喏,那就是直道。”

魏延望着面前的大道,纳闷地问道:“那不是栈道吗?”

这条大道全是用黄土夯实,平、直、宽,最宽处能同时并排行驶十二辆大车,若不是黄土铺就而是用水泥或沥青铺就,跟后世的高速公路没什么两样,而且这条大道虽然是黄土铺就的,却夯实得很坚硬,以至于道路两旁顶多只长草,不长任何灌木,碰到雨雪,也只是表面一层薄薄的泥浆飞溅,雨水大多流向两侧的沟渠,不会沁入土里使得道路松软难行。

贾诩笑道:“主公,您把栈道和直道搞混了。人们为了在深山峡谷通行道路平坦无阻,便在河水隔绝的悬崖绝壁上用器物开凿一些孔穴,孔**插上木桩,上面横铺木板,可以行人和通车,这就叫栈道。高楼馆阁间架空的通道,亦称栈道,比如洛阳南宫与北宫之间便是用栈道相连。最为知名的栈道便是秦国时期修筑的关中通往蜀中的四条栈道,蔡泽曾说,栈道千里,通于蜀汉,使天下畏秦。”

魏延这才想起了那个有名的典故,“明修栈道暗渡陈仓”。

公元前206年,项羽依仗强大的兵力,迫使先入秦都咸阳的刘邦退出,自己率兵进入,并称西楚霸王。接着,项羽封刘邦为汉王,让他统治偏远的汉中和巴蜀地区。同时,为防止刘邦再入关中,项羽将富饶的关中让给秦军的降将章邯把守。刘邦自知兵力不如项羽,只得忍气吞声。在去封地的路上,他采用张良的计策,将长达好几百里的栈道全部烧掉,以示再无回关中之心,从而使项羽对其疏于戒备。同年八月,有人起兵反项。刘邦认为这是个出兵关中的好时机。大将韩信提出了明修栈道,暗渡陈仓的计策,建议派人去修栈道以迷惑敌方,刘邦采纳了他的建议,并开始修复栈道。守卫关中的秦降将章邯讥笑刘邦不知要修到何年何月。实际上,韩信暗地里正为攻打陈仓积极地作准备。不久,韩信迅速出兵,攻下了陈仓。章邯得知后非常恐慌,但为时已晚。借道于陈仓,刘邦军队很快攻打并占领了关中,为以后建立汉朝奠定了基础。

魏延这时才恍然想起,直道则是秦始皇为攻防匈奴,令大将蒙恬率数十万军工、民工突击修筑的国防道路,起自甘泉宫,止于九原郡,长一千八百里,路线大体南北相直,因称“直道”或“秦直道”。

这是秦始皇吞并六国,统一华夏之后,除了统一文字、货币、度量衡等政绩之外,办的两件举世瞩目的大事之一,其一是修筑了万里长城,其二便是修建了一条类似后世的高速公路—秦直道。

秦直道纵穿陕北黄土高原,多依山势堑山成路,劈峁为道,垭口宽畅,逢沟渠多夯筑,直道要求路面尽量取直,以便车马急速驰驶,所过之处,地势多险恶,人迹至今罕至。

直道最宽处可供百驾马车并排行进,其宽度是后世任何高速公路都望尘莫及的,是世界上最早、最长、最宽的超级车马路。

魏延一边沿着直道策马行走,一边听贾诩介绍这个秦直道的详细情况。

秦始皇统一六国的第五年,为了抵御日以前强大的匈奴,便派将军蒙恬率领三十万大军北征,把匈奴驱逐到阴山山脉以北。秦军渡过黄河,控制了阴山山脉上的高阙要塞,并在新得到的土地上建立了三十四座县城,由内地迁徙人民到这些新县,从事耕种,为了管理这些新县,还另设了一个九原郡。当时匈奴人正在势力扩充期,不会因为一时的挫折失败而放弃向南侵略的意图,秦始皇自然也明白其中的底蕴,所以除设置郡县,迁徙人口等项措施外,还在阴山山脉上修筑了长城,那里本有赵国长城的旧址,加工缮修是比较容易的。这时又修筑长城是不是意味着采取消极防御的战略?不是的。秦始皇对匈奴的战略不是消极防御,而是积极防御,直道的修筑就是最好的证明。

直道修筑于驱逐匈奴后第二年,全长一千八百里,是当时由咸阳至九原郡的最为捷近的道路,如果匈奴人胆敢再次发动侵略,秦王朝的援兵就可由咸阳循着直道直抵九原郡,登上阴山山脉。

秦直道是一条名副其实的古代军用高速公路,通过这条大道,可以快速的将北方戍边所需大量战略物资、兵源从都城咸阳运达北疆军事要塞。

北部边疆一旦出现险情,骑兵部队通过秦直道三天三夜就可以从咸阳赶到九原,七天之内就能够基本完成从军队调动到后勤供应等一系列的准备工作,一千八百里长的直道,为大秦帝国迅速投放部队,及时输送粮草,最终战胜匈奴提供了根本保障。

魏延不禁感叹道:“如果说长城像一面横挡着的盾,那么秦直道就是一柄直刺而出的矛;如果说长城是一张拉开的弓,那么秦直道就是一支即将飞出的箭。”

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