第169章 砲击军营
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为什么后世攻防战时特别重视山头高地？就是因为对于远程武器来说，山瘠线具有绝大的优势。更多小说ltxs520.com居高临下，既利于观察，还可以有效地增大射程，前方一览无余，敌人的阵地基本都在火力覆盖下。而自己的阵地掩藏在山瘠线的背面，敌人看不见，还有效减少了受打击面。进攻方的远程武器弹道越低平，这种优势就越明显，几乎无法克服。
这个年代，能够威胁到山瘠线后侧的曲射武器，大概只有弓箭了。不过以弓箭的威力和射程，宋军完全可以不考虑。
交趾人要想破坏掉山坡背后的石砲阵地，最理智的办法就是进山谷，绕到后面进攻。徐平也是这样想的，所以给交趾人把谷口都留了出来。
至于山谷里面有什么，那是另一个问题。反正徐平想把交趾人留下来的关键，靠的不是山上的石砲，这些石砲不过是把交趾人向山谷里赶的。
石全彬早就注意到了这一排一排的大家伙，他还没见过这样壮观的场景呢，早就想让徐平打两砲给他看看，不过因为打空砲会让徐平为难，才没有提出来。现在山那边就是交趾前锋，哪里还能忍得住？
转了一圈回来，石全彬对徐平道：“云行，你说交趾军营离我们这里有多远？我能看见他们的人影晃动，想来也没多远吧？”
徐平看了看，随口道：“三百多丈吧，是没有多远。”
石全彬吃惊地看着徐平：“你真能看出来？不是说来唬我的？虽然天上有月亮，现在到底是晚上，你怎么能够看得清楚？”
“阁长，你天天在宫里，不像我这种天天在外面跑的。才会觉得奇怪。不管是白天还是晚上，我只看眼里见到的交趾人如何，大致不会错。”
“五十米可以看出两眼如黑点，一百米可以看出人脸模样，二百米可以看出头部和肩部的轮廓，三到四百米可以看出服装颜色和手中武器。七八百米可以看出行走和跑步的动作。”
徐平前世对那民兵训练手册是烂熟于胸的，到了谅州校正砲位和射程，又特意校正过，甚至白天黑夜的差别都与操砲兵士仔细研究。依他现在只能看出交趾兵士轮郭的感觉，应当就是三四百丈的样子。
目测距离说起来很神奇，实际上只要经过适当训练，掌握对了方法，很容易就能看个不离十。以石砲的精度，徐平甚至都没推广拇指测距法。就是让兵士纯用肉眼看，只用几天的时间，山顶上为石砲做观察的兵士，能够把山前的距离用眼测的误差控制到三丈以内。
就在山前，一些不起眼的标志物，比如形似老虎的那块大石头，距山顶是一百八十丈，那棵孤零零的大榕树。距离是二百二十六丈，被遗弃的草屋。距离是二百七十八丈，而被交趾人圈进军营的那处小水潭，恰好是三百一十八丈。这都是早就用尺子测好了的，丝毫不会错，徐平就差把周围的地形画出坐标图来，标志物标上去了。
说起来徐平还没注意交趾军营圈进水潭标志物呢。不然更准确。
石全彬也不知道徐平说得是真是假，不过这种事情他是一窍不通，也只好姑且信了。
借着皎洁的月光，石全彬伸着脑袋又看了一会交趾军营，对徐平道：“如此大好月夜。云行何不让石砲打打交趾军营试试？也看看效果如何。不然等到交趾大军到来，结果打得不尽如人意，岂不是尴尬？”
徐平知道石全彬只是按捺不住想看看热闹，当时安排砲位试射的时候又没有瞒着他。不过这种事无关紧要，不好拂了这位皇上身边人的心思，便点头道：“也好，这个时光，交趾人应该刚刚开始休息，不妨吓一吓他们。”
把鲁芳叫过来，徐平问他：“前面交趾军营，距这里有多远？”
“禀官人，若是从军营中心帅帐算起来，是三百二十丈。”鲁芳是在这里的指挥，这种数据早就观察清楚，可不能临时估算。
徐平道：“三百多丈，中等石砲刚好能用。你去安排人，不用多，打一个齐射就好，吓吓交趾人，让他们睡不成觉！”
鲁芳应诺，一路跑着去安排。
过了没多大一会，鲁芳回来，问徐平：“官人，要不要让谷那边的山头也一起来？只要打得好，山下的军营就废了。”
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