第164章 口袋阵
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孙七郎得了吩咐，硬生生地把身子停住。这墙面又光滑，斜度又大，他哪里能够停得下来？连着倒退了三五步，才勉强站住身子。
徐平又道：“好了，就从你站的地方，慢慢走上来！让住，要慢慢走！”
孙七郎屏气凝神，轻轻抬了左腿起来。这腿一抬起来，身子就站不住，又倒退了两三步，差点趴在墙上。
向上面抬起头，孙七朗喊道：“官人，走得慢了不成的，站不住身子！”
徐平笑道：“你跑着能上，走着必然也能上，想想办法！”
孙七郎就蹲在墙上想了一会，才又站起身子，猛地抬起左腿，迅速地向前落去，试试巴得牢实了，才又抬起右腿。
就这样一步一步，走得小心翼翼，孙七郎直花了一炷香多的时间，才又重新走上了墙头，对徐平道：“官人，这墙走得慢了不好上来的！”
“这样就对了，我可不信交趾兵能够冒着箭雨和滚木，飞奔着上来。就是按照这个样子，其他地方也照样修起来！”
石全彬在一边看着热闹，问徐平：“既然是怕交趾人冲上墙，何不就如同城墙一般，修成直上直下的？那个样子，除非他们会飞，才能上墙头。”
徐平道：“阁长说得有道理，不过直的却有几项比不过斜的。第一，如果是直上直下，如此高耸，墙上的人看不到墙根，如果敌军在墙下动手脚，难以防备。第二个，滚木只能沿墙而下，作用不大。第三个，斜的墙体，底部宽大，比直墙坚实得多，也好修筑。阁长，所以还是斜墙好。”
石全彬也就随口一说，真正细论起来他可是不懂，听徐平说得貌似有道理，便也就不再说什么。
城墙最早修成直上直下的，是对应于守城和攻城的手段缺乏，随着经验的积累，手段的增多，实际上有识之士已经发现了斜面城墙更加有效。到了两宋之交的时候，守城大师陈规作《守城录》，系统地提出了城墙不应太高，应修成斜面而不是垂直，城墙不要有直角等诸多原则。
徐平不知道这些，但他知道对于远射武器来说，斜面城墙更有效。拉长了敌军攻城的距离，增加了攻城者受打击的范围，减少了墙上的打击死角，也有利于布置守城器械，好处多得说不完。而坏处，除了心理上觉得好攻之外，几乎没有实质上的缺点。
这也是为什么到了热兵器的枪炮时代，山坡是进攻方的噩梦，但悬崖却不是。防守方选择战场，第一选择就是山坡，悬崖则没什么价值。
顺着土墙，一直到了谷口，墙一路修到山顶。
石全彬随着徐平登上谷口旁的小山，发现这里也有大量民夫正在修整山体斜面，才知道徐平是把整个面对进攻方的一侧，全修成这个样子。
山体修整的进度更快一些，此时已经接近完成，民夫正在山顶上布置防守的器具，成组地安装滚木。
石全彬看不出个所以然，只是站在山上看南边的交趾。出了这个谷口，丘陵间的路便宽阔起来，再也没有险阻。借着今天的晴朗天气，可以看到远处交趾的村寨。
在山上指挥的桑怿见到两人上山，过来见过了礼，与石全彬寒喧罢了，对徐平道：“你来得正好，我这里得到消息，交趾已经自富良江岸准备发兵。一万交趾主力，加上附近各州土兵，总计一万七八千人，诈称八万，要来攻谅州。预计半个月后就会到达，我们这里要抓紧了！”
（晚上还有一章。）
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