第十三章、河北棱堡
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曹军主力，则直接开到邺城南方，距城里许，扎下营寨。
邺城本为魏郡的郡治，袁绍入主后又多次扩建和增筑，规模宏大，甚至超过了新京许都，直逼旧都雒阳，曹家谋士们登橹远眺，全都不禁倒吸一口凉气。只有是勋不为所动——这城墙是挺高啦，可是比得上自己前一世见过的西安古城墙吗？城池是挺大啦，可是比得上自己前一世见过的老北京城区吗？尤其这年月城墙多为土垒，只在城门附近以部分烧砖加固，有何宏伟、坚固可言？
只是……这年月的攻城器械，也没法跟后世相比啊。
但是登高而望之后，他不禁又有些疑惑，用手一指城上每隔一百步就一个的，突出于城堞之外的小木房子，问身旁的贾诩：“勋前次来，不见有此物，此何物也？”
他上一回被荀谌带到邺城来的时候，光看到城上四角有楼了，如今却密密麻麻地新搭了很多临时建筑物，其中便于士卒歇息的小屋和箭橹，他一瞧就知道干啥用的，但那些木房子又是WHAT了？
贾诩回答他说：“此楼突出于城堞之外，三面开孔，可交叉相射，锁闭城墙也。”
是勋一边听他解释，一边又仔细观察了好半天，这才终于恍然大悟，不禁大吃一惊——这、这跟棱堡是相同的原理啊！中世纪的棱堡在城墙上造出很多凹面来，除部分死角外，攻击任一点都会使攻方暴露在超过两个射击点面前，守方可以通过交叉火力给予多重打击。是勋记得某本穿越小说当中，主角回到古代以后就在边境线上大造棱堡来着，他可没想到，敢情这智慧古人早就有啊。这种木房子就坚固程度而言，自然比不上棱堡本身，但可能达成的防御效果是相同的，而且遇警则建，无警则拆，不必要在建城的时候就预先设置，更比正式的棱堡省了无数的工料！
仔细想想也是，这年月大城在城门外往往还建有瓮城，呈方形或半圆形，突出于平整的城墙之外，使得城门两侧可以一定程度上达成交叉火力的效果，古人既然明白这种功能，怎会不大加利用呢？还真是不能小瞧古人的智慧啊！
面对这样的城墙，蚁附必难——该怎么办呢？是勋不禁陷入了沉思之中。他回忆前世所读过的史书，在原本的历史上，曹操是怎样攻克了邺城的？哦，首先，曹操在城外挖掘长壕，引漳河水灌入，隔绝了内外联系，然后摧垮袁尚的破围兵马，极大地削弱了城内士气。终于在粮尽援绝以后，审荣献城……
这招儿可以用于今日吗？似乎并不怎么合适啊。挖壕是件大工程，很容易遭到阻挠和破坏，所以在原本的历史上，曹操就是先浅浅地挖，瞧得城上的审配直冷笑，完全不当回事儿，这才能够一夜之间增添人手，快速完成。可是如今袁绍大军就在四十里外，要是闻讯突然杀至，正忙着挖壕的曹军就可能瞬间崩溃。原本的历史上，袁尚所部不如今天的袁绍，而且背后还有袁谭牵制，所以曹操才敢赌这么一把，在这条时间线上，起码这时候还赌不得。
是勋微微撇了撇嘴，心说这条计我先留着，以后视战局的发展，若情况符合，再给曹操献上吧，现在……还是别提为好。
他从楼橹上下来的时候，曹操就已经把兵马拉散开来，团团围住了邺城。邺城西、北两面都濒临漳水，曹军在水面上建起了浮桥，渡过漳水立下部分营垒。所谓包围，当然不可能真的把人全都撒开，手拉手的水泄不通，除主攻方向外，只要能够立一些营垒，防堵敌军联络和逃逸即可。曹操自然是把主攻方向摆在了不临水的南、东两面，漳水对岸的营垒数并不多，这也是示弱于敌，希望袁绍一时昏了头，会率军去奇袭那支部队，自己就可以挥动主力经浮桥过河，去跟袁绍主力决战。
漳水对于自己的进攻来说是阻碍，对于审配的出城来说也是阻碍，若在漳北、漳西开战，他想趁自己跟袁绍对决的时候突然出城夹击，难度也是相当大的。从某种意义上来说，这比在邺城南面的平原上决战，效果会更好。
曹操安营已毕，就先召了是勋和刘晔过来，说：“卿等速备战具，三日后便要攻城。”刘晔谏阻到：“我军初至，器械未完，三日无乃太促乎？”是勋却微微一笑，说出了相反的话：“审配必料我三日后相攻也，何不明日即攻，出其不意，或可得胜？”
曹操一皱眉头，望向是勋：“明日即可攻城？军中无戏言！”
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