第十五章、初攻邺城
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转念再一想,我不会总有人会啊,这年月的数学虽然并不发达,但找几个顶尖人物出来研究一下弹道问题,应该不会太难吧——反正抛石车的精度就摆在那儿呢,哪怕算得再清楚,误差率仍然小不了,能够比谢徵这废物算得精准一点儿都是胜利。
那么,上哪儿去找数学强人呢?好在眼前就有一位,郑玄郑康成在这年月算是众所周知的尖子人物,据说他曾经帮助马融演算过浑天问题——具体那浑天说的是什么,是勋自然不明白,但想也知道,不会是纯粹的占卜、巫术,而必有数学夹杂在内啊。于是是勋就主动登门,趁着恳求郑玄给水师拨付点儿物资的机会,小心翼翼地讨教了一番。
郑玄倒是对这个问题挺感兴趣,当即取出算筹来,在是勋面前摆了一回。是勋满面钦慕地……有看没有懂,所以转头就把郭淮给推了出去。郭淮跟郑玄学了好几天。回来跟是勋说,这个问题啊……瞧着简单,算起来复杂,郑先生也刚摸着点门儿而已——是勋不知道,这相关三角函数问题,得明朝才正式传入中国,中国人以前不是没有研究过。但零零散散的完全不成体系。
是勋琢磨了一会儿,说没问题,摸着门儿就成,我不信郑老师还算不过谢道士。咱们计算跟试验辅助着来,排开抛石车,瞄着一个目标来回打。完了按照不同的距离,配合不同的配重,列出一张表格来,再在抛石车上做了记号,肯定精度能够大大提升。
所以昨天晚上,郭淮出营去勘测地形,就顺便目测了一下距离。计算了一番参数。等到正式进攻的时候,一溜三十具抛石车排开,郭淮又蘸点儿口水,举起手指来,大致测了一番风速,翻开表格,当即报出一连串数字来。
诸葛亮在旁边见了,不禁双眼放光。是勋在旁边瞧见了。心说孔明果然有当发明家的潜质啊,看起来这玩意儿很对他胃口嘛。
这会儿功夫,曹操也到了,当然啦,他不会亲临第一线,只是携着十二岁的次子曹丕登上了身后百步外的一座箭橹。曹操这回出征,没有带长子曹昂。而带上了曹丕,曹昂被任命为五官中郎将,留守许都——是勋明白,这就等于半正式地确定了曹昂的继承人地位。
眼看一切就续。是勋遣董蒙快马传报曹操。时候不大,就听得身后鼓声震天般响起,是勋当即挥旗下令:“射!”
在此之前,按照郭淮的计算,士卒们已经都把石弹和配重准备好了,小旗一挥,快刀斩下,割断绑缚抛杆长端的皮索,短杆配重飞速下坠,于是三十枚五十斤重石弹便划着一道道弧线,直向城下飞去。
是勋手搭凉蓬,定睛观瞧,嘿,你还别说,郭淮计算得挺准,这要是瞄的城墙,估计起码能中一半儿。然而问题目标并不是城墙,而是城壕内侧的羊马墙,或名羊马垣。象邺城这种大城,不可能光守城墙,而先得垒羊马墙在城外守御,争取极大杀伤攻城之敌。审配确实设置了多处羊马墙,基本上封堵了曹军逾壕之路。
羊马墙也就一人高,目标比城墙要小得太多了,所以这一轮抛石,虽然左右偏的不多,但或近或远,或者堕入城壕,激起高高的水花来,或者直接逾垣而过,几乎就砸在城墙上,最终只有四枚中的。
但这就已经挺够的了,羊马墙都是临时以土垒城,夯得并不结实,一枚石弹砸到,就是一个大豁口,至于豁口后面的袁兵,估计直接连尸体都碎了。曹洪所部就护卫在抛石车左右,见状全都举臂欢呼。是勋唇边也不禁露出了微笑,干脆把手中指挥小旗递给郭淮,鼓励道:“甚好,且再投四轮者。”
郭淮躬身接过小旗,然后再测一遍风速,调整了一些参数,又是连续四轮石弹发出。几乎每轮都有四、五枚石弹中的,前后五轮一百五十枚石弹扫过,邺城东城门南侧长达二十丈的一段羊马墙,就几乎给砸得跟被狗啃过的麦饼似的,基本上起不到什么防御作用啦。
眼见得大群袁兵被迫从羊马墙后撤出来,部分绕到城门附近,城门拉开一条小缝,放他们进入,部分直接就抓着城上放下的绳索,手脚并用爬了上去。曹洪见状大喜,就待下令:“负土,填壕!”却被是勋给拦住了。是勋说且慢啊,尚有一物须破,以免遭受不必要的死伤。
他瞄上了城墙上那些突出堞外的小木房子。
PS:怎么样,诸葛亮也到手了,这回大家伙儿满意了吧。主角从此真要左诸葛、右司马、鲁肃在中间……
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