第两千四百七十五章 护城河
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护城河是一种人工开挖的壕沟，引水注入，形成人工河作为城墙的屏障，一方面维护城内安全，另一方面阻止攻城者的进入，这是古人在防御手段上对水的妙用。最新地址ltxsba.xyz护城河内沿筑有“壕墙”一道，外逼壕堑，内为夹道，大大提高了护城河的防御作战能力。
西夏王城的护城河十丈有余，相比中原几座大城算不得什么，天下护城河，以襄阳护城河宽度为最。据说，襄阳护城河的平均宽度就超来了180米，最宽处达到250余米，堪称中原第一城池。西夏皇城虽比不上襄阳，但十丈的护城河，此时却也让西北大军非常的头疼。
进攻拥有护城河的城池，其实古代所有军队都没有太好的办法，基本只有两条路可走，一是围困，二是填河。先说围困，攻城战最适合的其实就是围困，断其补给，等到敌人弹尽粮绝自然也就投降了，可是西夏准备这么长时间，城内肯定准备了大量的粮草物质，想要围困没个一年半载估计不大可能。
二是填河，根据西北军大作战经验，进攻拥有护城河的城池，有效的方式，是先远程火力压制，在把对方压制住之后，派步兵填沙袋！
中原王朝，蛮夷之地的人那样，正规战场上是不允许用尸体做攻城道具的！一方面中原人将就逝者为大，最忌讳死无全尸，另一方面因为在过河之前，不可能有尸体给你填河啊，跟不可能让自己都士兵，站在那里先让敌人射杀，然后在让后面的人把他们当填河的材料。
所以，攻城时使用沙袋才是最佳过河工具！也曾有人在战争之中尝试过，搭梯子过河，但这样却丧失的灵活的行动，而且人比较集中，是敌人弓箭手的最佳活靶子！
而且攻城前不可能有太多的材料，帮助建造过河工具，最最方便且不管那里的陆战都能轻易得到的就是泥土！沙袋那玩意儿不值钱，造价底，不费时间，是人都会！
综合考虑，沙袋填河才是最适合的办法，曾易等人商量了一通之后，很快便确定就按照这个办法来弄，正好死字营的那些人，可以来担当此任！
确定作战计划之后，西北大军开始收集麻袋，麻袋非常常见，大军的粮草全都是用麻袋来装得，西北大军都不用从国内调集，本身军中就有很多。
大军几乎是全体行动，很快一堆一堆的沙袋，堆放在了前线，行动开始之前，西北大军的火炮弓箭手弩炮等等远程火力，对西夏王城，发动了猛烈的进攻。尽管西夏人也进行了反击，但不管是火力还是密度，远远比不上西北军，很快西夏守军就被压制下来。
压制住守军之后，刀盾兵盯着巨盾，掩护这死字营的几万人马，扛着沙袋冲了上去，一个个沙袋被扔进了水中，可是这护城河的河水实在太过湍急了，沙袋刚刚扔进去，就被冲散了！
“水流太湍急了，如果这样，扔下在多的沙袋也无济于事！”曾易有些担心的说道。
“是啊，将军有没有什么办法？”青龙撼天曾易等人，别看都是超一流高手，但要论领兵打仗，他们五个加起来，信息都比不上西北大军那些身经百战的将军。
西北大军主帅，身经百战，笑了笑说道，“诸位大人放心，这不是什么大问题！”其当即下令，让一直军队，前往上游，堵截河水。
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