第一百六十章 颗粒火药

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    ,明末辽东从军行
    次日一早,张春把粮饷、武器等物资移交给杨林,核实无误后便启程返回沈阳。陈尚仁和王崇信则在张祝等人的引领下,带领手下熟悉叆阳地形和城防。当他们等上城墙观看各种城防工事时,暗中对杨林也是佩服的很。
    叆阳城外现有三道护城壕,内外布满了拒马、尖木桩和鹿砦等障碍物。而每道壕沟掘出来的土都堆到里侧沟沿上,经过夯实后形成一堵一到两尺高的梯形矮墙。
    这道矮墙连同壕沟都被浇上了水,与地上的积雪混合后冻了一层冰,不仅变的坚硬也变的极为光滑。人掉在里面想爬出来就变得很困难。即使爬上来继续前进,也要必须跨过这道矮墙,这样就会暴露在城上守军的火力之下。
    三道壕沟之后是与叆河联通的护城河,如今封冻可以徒涉,但是冰面上被官兵凿出了大大小小许多冰窟窿。里面有渔网露出水面,尔后有绳索绑着渔网延伸到城头上。不明所以的人会以为这是一种冬天捕鱼的方式。
    其实这些绳索和渔网连接着一种名为“水底鸣雷”的水雷。这种水雷铁制,放入密封的大缸中沉于水下。拉火装置经绳索延伸至城上,有敌接近和路过就可拉响引爆。
    叆阳武库原有百十枚这种水雷,这段时间杨林又命工匠造了一些,悉数沉于护城河之下。这种水雷是专门用来炸战船的,威力极大。假如有敌军蜂拥而至攻城时,守军可将其引爆造成大范围杀伤效果。这就好比后世二战时德军用88毫米高炮打坦克———“一炮一个小朋友”。而它则是“一枚送走一片小朋友”。
    护城河之后是羊马墙,它本是用来圈住城外百姓带来的牛羊猪马等家畜的,后来发展成为城防工事。里面应用木板、木桩等物隔成不等的隔间,中间有小道和木门联通。便于藏兵和阻击敌军靠近城墙。但是杨林没有那么多兵力,只能把它当做迟滞敌军进攻的城防工事之一。
    最让陈尚仁和王崇信纳闷的是,城门前的护城河上是一座固定土桥,不是常见的吊桥。在战时这就容易让敌军快速接近城门,于守城极为不利。
    张祝给众人解释道:“各位兄弟有所不知,按照备御大人的说法这叫欲擒故纵之计。意思是说城门是敌人必攻之处,但也是守军火力、兵力最密集之处。留下固定的桥梁,就是引诱敌军来攻,趁机大量杀伤他们。同时也可为我军出城反击和撤退留下道路。”
    “原来如此。不过若是敌军集中兵力连续猛攻城门,这种留下固定桥梁的做法还是有些冒险。”陈尚仁和王崇信等人说出担忧。
    张祝指着土桥道:“备御大人也留了后手,桥下沉了水雷。如果城门真的守不住,那么引爆水雷就可截断过河敌军的退路,让其首尾不能相顾,落入城上我军打击之中。”
    “嗯,备御大人看着年轻,主意倒是挺多。”陈尚仁和王崇信等人赞道。
    “那是那是。老话说‘有志不在年高’,你们可别小瞧我们备御大人。当初他领着我们深入敌穴打雅尔古寨的时候,在山上草窠里愣是爬了好几天不挪窝儿,就为了侦察敌情........”张祝一阵显摆,满脸的得意之情。
    陈尚仁等张祝说完,指着城下问道:“我说张老哥,门前那道墙是干啥用的?昨天我们进城的时候就注意到了,影响进出挺碍事的。可惜我当时没好意思问。”
    张祝嘿嘿一笑道:“那叫护门墙,专门保护城门的。这道墙高七尺、厚两尺半,离城门十余丈,左右各延伸出两三丈的空挡。为的就是遮挡敌人视线,不让他们从城门看见城内的情况。而且敌军想靠近城门就必须要绕过这道墙。趁这个机会,我们就可以大量杀伤他们。”
    这时陈尚仁手下的一名哨官问道:“敌人要是把这道墙直接推到怎么办?城门不就直接露出来了吗。”
    张祝看了对方一眼,有点鄙夷道:“推倒?这道墙光地基就挖了一丈多深。备御大人还在里面横竖交叉每隔一尺就插了一根铁棒,用铁丝缠绕绑牢,外面又抹上了厚厚的白灰和砂浆。他说这墙虽然比不上那个什么.......什么钢筋混凝土的墙结实,但想一下子把它推倒,就不要做这个梦了。看见城门两旁马面墙上那些箭孔没有,那里面都是藏兵洞。到时候有弓弩手和火枪手下到里面,可以从侧面射击靠近这道墙的敌军。”
    张祝继续显摆道:“你们看看这城上正在建造的平顶墙和战棚,敌军再密集的箭矢也休想伤到守城的弟兄们。再看这些拍杆、推耙、滚木、礌石等守城器械,还有咱们身后那些投石车、弩炮。哼,建奴想攻下叆阳,不死上几万人那是休想!用杨备御的话说,就是要把叆阳变成那些胡贼的肉碾子,来多少搭多少!”
    陈尚仁和王崇信听罢心中很是惊骇,如今官军中可没谁愿意把城防工事修的这样周密坚固。不仅费时费力还费钱,而且真打起来也没什么大用处。索性不如直接拿刀
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