第十六章、城下轒辒
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为了能够交叉射击妄图蚁附登城的敌军，近乎完美地遮护城墙，中国古代虽然不懂得造棱堡，但是知道造马面。更多小说ltxs520.com所谓马面，就是跟瓮城形制相仿，在平整的城墙上每隔一段距离（一般是一箭之地）就建一距形燉台。《墨子》论城守诸篇中，即提到过此制，倘若邺城也建有马面，就是勋这种才研发出来的粗陋的配重抛石车，是拿它一点儿办法也没有的。
土墙的坚固程度虽然不如砖墙，也都经过工匠反复夯实，除非石弹正好打在某个关键部位，否则也就掉层墙皮而已，是根本轰不塌的。
不过好在邺城并没有马面的设置，而是临时搭建了一些突出于城堞之外的小木房子，以达成可交叉射击的马面的效果。对于这些小木房子，是勋还是完全有信心用抛石车将其逐一击毁的。
然而问题是，小房子实在太小，而抛石车的精度相当有限，根据刚才轰击羊马墙的经验来判断，是勋估计起码得二十枚石弹，才能砸垮一间小木房……
不是随便搬块石头来就能上投石机的，是勋经过反复试验，确定了石块的形状越不规则，精度的损失就越大——想也知道，你要是用块石板，说不定直接就乘风飘得不知道哪儿去了——最好用磨圆的石弹。然而石弹沉重，不是那么好携带的，是勋总共也就带到前线三百枚，刚才五轮抛石，直接就扔光了一半儿。那些砸中羊马墙的，或者翻越羊马墙落到城根儿下的，等会还能央求曹洪攻城的部队想办法弄回来，那些直接掉城壕里的，不等仗打完，那是休想再捞起来啊。
所以是勋不敢再用石弹了，再用就要“破产”。他吩咐郭淮换上火药球，然后五具抛石车瞄准一间小木房。集火轰击。
这些火药球乃是以麻纸层层包裹火药制成的，工艺很简单，他这回带了不少纸张和火药来，用光了还能临时现造，多扔点儿也不可惜。虽然老式黑火药基本上没啥爆炸力，但用来燃点目标还是很方便的，反正对面是木房子嘛。我不必要把你轰塌，直接把你烧了多好啊。
于是郭淮准备停当后，小旗一挥，当即三十枚冒着火光的火药球就直向邺城飞去。是勋远远地观察，只见这第一轮竟然无一中的，只有六、七枚砸在城墙上。冒起一溜火光，不多会儿就灭了，大部分都落在城下，还有几枚飞上城头，估计也不会有啥成果。
郭淮有些愠怒，大声斥喝那些发礮的兵卒，重新调距。然后又放了一轮。这回效果不错，有两枚击中了小木房子，一枚的位置有点儿偏，竟然被弹开了，另一枚则当即点燃了小木房，火光冲天而起。
是勋暗中一捏拳头，心说有戏。我也不必要把你城东的小木房全都烧光啊，能够烧掉三、四间。就足够掩护曹洪填壕了。
正在等待第三轮火药球的轰击，忽听不远处的诸葛亮大声叫了起来：“且慢！”是勋转头望去，就见诸葛亮正扳着郭淮的手，不让他把小旗挥下。于是他催马过去，冷着脸问道：“何事？”
诸葛亮抬手一指城头：“敌已有应对之策矣。”是勋循他所指的方向望过去，瞪了半天眼睛，这才略有所得——“咦。小木房子变色儿啦。”就听诸葛亮解释说：“适才见有守卒将席遮于楼外，席色不黄而褐，料以湿泥涂之也，难以再燃。”
是勋心说你小子眼神儿倒是好啊。赶紧再瞧向郭淮，就见郭伯济紧皱双眉，仍然在那儿眺望，好一会儿才转回头来，轻声叹息道：“孔明所言是也，再发无益。”
是勋明白了，当初官渡之战，曹操就显示过抛石车扔火球的威力（虽然当时是用的火药罐），袁军吃一堑、长一智，不会毫无应对之策。再说了，就算没有火药，也怕攻方用火箭攒射来破坏木房啊，所以早就预备下了涂满湿泥的竹席或者草帘。没有预先挂出来，大概是日头太毒，怕没多会儿就把泥给烘干了，层层剥落，打算遇到危机到临时措手。嗯，守将的反应很快，从我抛发第一轮火药球，到他挂出湿帘来，中间有十分钟没有？难道审正南此刻便正在东城城楼上指挥吗？
既然对方已经有了防备，那再发火药球就毫无意义啦，白白浪费资源。是勋无奈之下，策马来到曹洪面前，告诉他礮石掩护就到此为止了，你可以发起进攻了。谁料曹洪却通红着脸答道：“且稍待片刻。”
曹洪的第一步计划，是冒着城上箭羽，先把护城壕给填了，以便快速接近城墙。当然啦，他不会直接让小兵举着盾牌往前冲，那也是准备好了相应的攻城器械的。
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