第章 攻难守易(2 / 2)

“那是为何?”马端临疑惑地道。

“这……”徐无难皱皱眉,现在战事正急,他不想分神解释,可马端临也是一室主事,自己不好推辞,想想言道,“马主事,城墙外部看似平直,其实内部却另有乾坤,尤其是边防重镇,更是如此,像襄阳这种大城,墙体之中定然另有布置,绝非眼前所见。”

“哦,愿听其详!”马端临往前凑了凑道。

徐无难听了心中暗自叫苦,本想敷衍两句打发了,却没想到其求知欲这么强,可也只能说下去:“城墙之上会在修建之初暗自开些暗门,门洞或开于城墙体内侧,通向墙体顶部;或穿过墙体,沟通墙体内外;也有个别开于墙体外侧,通向墙体顶部的。只开于城墙体内侧,通向墙体顶部的门称之为“登城门”,或位于敌台旁,或位于较长一段墙体中部,乃为便于守御城防的主、客兵军士上下墙体而建,这种门规模普遍较小,宽者两人并行,窄者仅容单人通过。”

“除此以外,还有规模较小者,多为暗门。与前述两类不同的是,这类门一般规模较小,仅容单人通过;非传统人马通行路线,位置隐蔽,不易发现;还有开于墙体外侧,通向墙体顶部者的暗门,按理说从防御角度上考虑,应敌一面开门,简直是送死之举。但深谙守御之道的皆明白其中道理,此类暗门普遍建筑规模小,形制也最为简易,不经指点,根本无法发现。”

“当然事有万一,为了防止暗门暴露,其中也会设有机关,以阻断敌方借此进入。《墨子·墨突》篇有记载,在城墙内各个突门内皆要砌一个瓦窑形的灶,灶砌在门内四五尺处。突门上装盖瓦可让雨水流入门内,安排一军吏掌管堵塞突门,方法是:用木头捆住两个车轮,上面涂上泥巴,用绳索将其悬挂在突门内,根据门的宽窄,使车轮挂在门中四五尺处。设置窑灶,门旁再安装上皮风箱,灶中堆满柴禾艾叶。敌人攻进来时,就放下车轮堵塞住,点燃灶里的柴火,鼓动风箱,烟薰火烤来犯之敌。”

“原来其中还有如此多的曲折,吾妄言了!”马端临听明白了,拱手言道。

“不敢,是吾班门弄斧了!”徐无难赶紧还礼结束了对话,转而对陛下道,“事已不可为,再打下去只会徒增伤亡,是不是要伍都统撤下来?”

“我们只观战,不多言,一切自有他们做主,不要干扰前线指挥官的决心!”赵昺扭脸瞪了其一眼道。

“是,属下知错!”徐无难自然清楚战前陛下已经授予他们机宜之权,并表示不需事事请示,可以按照他们的想法去打。而自己的建议正是犯了忌,这也许就会打乱了人家的部署和进攻节奏,导致战事的延迟,甚至失败。

在西门双方混战,争夺城下的控制权之时,南门那边也展开了进攻。南城上的敌军被逗弄了几次后也学乖了,是不见兔子不撒鹰。而潘念要的就是这个,抓住城上兵力空虚的空当,遣兵过河竖起了云梯。敌军调兵不及,一番激战后,一处宋军竟成功的登上了城头。

赵昺的目光又被吸引到南城,他明白登上城头不等于控制了城墙,但这也是一个影响战局的节点,而成功的关键就是一个字——快。上城的军卒要快速巩固突破口,取得立足点;而城下的部队也要快速登城增援,协助先行登城的突击队建立稳固的桥头堡,接应后续部队上城。

后续部队的动作同样要快,必须迅速集结部队增援,将部队通过突破口源源不断的送上城去,与敌争夺城墙的控制权,并击退敌军,直至夺取城门,让大军入城。这三个环节是环环相扣,只要一处落空,就难以取得成功。

而在这方面敌军明显占据着优势,隐于藏兵洞中的敌军能够通过隐于城墙内部的登城道迅速上城,城下的敌军也可以从马道和梯道上城。城墙同样可以视为城池的外环路,其它各处的敌兵也能避开炮击的拦阻,利用城墙快速上城,沿着城墙进行增援,对上城的宋军进行夹击。

一旦大批敌军上城,他们就可以利用马面,从多个方位,采用各种手段对城下的宋军进行杀伤,掀翻云梯断绝上城的通道,并用弓弩封锁浮桥,截断对登城的军卒增援。而失去了援军的先登军卒,就是再能战也无法抵挡潮水般涌来的敌军,而结果不言自明……

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