第682章城墙之解
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“孙老师但说无妨，”朱由校一笑说道。更多小说ltxsba.com
“回皇上，城高三丈三尺，池深一丈五尺，城周围二十四里三百八十五步。城门六个，南二，左安定，右泰和。东二、南平夷，北广顺。西肃清，正北镇远。附筑土城，处东宁卫入附夷人，俗称北城，门三，东曰永智，西曰武靖，北曰无敌。角楼四座，东南名筹边（即清代魁星楼），东北名镇远，西南名望京，西北名平胡。钟，鼓楼各一处。辽阳城有一个特色，分南北两部分，北城面积小，人口相对也少；南城面积大，又为闹市之区♀点倒是无甚变化。”
孙承宗说的是辽阳城在当时建筑时的情形，那时，东宁卫、自在州置于北城，东宁卫建于洪武十九年，（1386年）为安置归附的女真人而设，位于无敌门里东侧÷设左、中、右、前、后及中左六个千户所，隆庆元年（1567年）辽东镇的总兵府由广宁卫迁到东宁卫。
而在永乐年间，自在州由开原城迁到辽阳，以处归附夷人，位于无敌门里西侧。
并且在万历四十八年，熊廷弼守辽东，那时又大修辽阳城，高厚壮固，屹然雄峙，当时就赞道，‘此城规模之宏大，城池之坚固为当时东北第一。’
南城内街道东西对称，形成若个干个十字街。辽东都司便治于今知东兄西北方。都司各职能机构及椽属，卫所也分布于成里各处。
而北城则是差之远矣。
“城墙高三丈三。那厚度呢？”朱由校曾经听过介绍，《营造法式》还是《木经》里面，有专门的墙厚与墙高比例的介绍，但这个比例数忘记了。而城墙厚度，这是决定战术的关键。
各地的城墙各项指标厚度均不一样，比如说京城的城墙门处，有二十多米厚，而平均墙基宽24米，墙高8米。西安的城垣高12米，底宽15-18米。顶宽12-14米。其余的地方就不一一列举了。
而这个时代的城墙。所采用的都是多为板筑的夯土墙，这东西太结实了，以前没有大炮之时，朱由校都没赶想过用炮轰≈在有了千余门大炮。虽然原始了一点。但他想试试有没有轰塌一段城墙的可能性。
“回皇上，辽阳城的厚度为二丈三尺左右。”这点倒是做了点功课。
“这厚度不小啊。”七米的厚度，别说是墙了。就是一堆土，也不是原始大炮可以轻易悍动的。
“皇上，不仅如此，而且辽阳城与盖州耀州等有很大的区别，他们有‘日’字型的瓮城，使得防御能力相当的强悍。破开了城门之后，还将要面临二道城门，这才是难中之难。而且，此城墙是相当正式的城墙，集中了城墙的许多优点，比如前面的城壕、女儿墙；还有马面突出部，用以从侧面攻击接近城墙之敌。”
“马面？”朱由校还真不懂怎么还有这样的名称。
“回皇上，就是左边的那里，按一间的间隔修筑的呈四方形建筑。别的城墙有为半圆形的，叫做团楼。但宋朝沈括认为，马面形式，比团楼更有效。”孙承宗帮着朱由校指着城墙上的几处地方说♀个皇上，说他聪明，那是绝顶的聪明，能识破自己都看不透的计策，但有时候连一些常规的东西都不懂。
“哦，还有吗？”
“城墙上的那些供射击用的凹凸状护墙，叫女墙，这个别处都有，但敌楼却不多，看那边的一处建筑，就是敌楼，可以用来观察和监视敌人的行动。”
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