《长城的故事》首日封邮集——第3框

3.5 狼烟四起的烽火台将传递军情变得更加迅速：烽火台：作为一种防御体系，长城不仅是防御性质的阻止、延缓入侵，也需要及时将军情传递至后方，起到通报战情、增兵求援的作用。烽火台就是这样一种设施，是古代的军事报警系统，往往与长城并存，组成完整的军事防御系统，也可以单独设立，成为古代速度最快最为有效的信息传递方法。烽火台也称烽燧，春秋战国时白天燃烟叫烽，夜晚放火叫燧，故名烽燧。烽火台通常设置于长城沿线，西域大漠戈壁千里，视野开阔，高耸的烽火台遍布天山南北，这也是汉长城在西域地区的主要形式，警戒边境的同时也护卫着丝绸之路。今天新疆库车境内的克孜尔烽燧便是遗留至今的汉代烽燧遗址之一。

3.5 Beacon Towers Amidst Flames of War Accelerated the Transmission of Military Intelligence: Beacon Towers
As a defensive system, the Great Wall not only served to hinder or delay invasions but also facilitated the swift transmission of military intelligence to the rear, enabling the reporting of battle conditions and requests for reinforcements. Beacon towers were precisely such facilities—an ancient military alert system often coexisting with the Great Wall to form a comprehensive military defense network. They could also be established independently, serving as the fastest and most effective method of information transmission in ancient times.

Beacon towers, also known as "feng sui" (烽燧), were named for their distinct signaling methods: during the Spring and Autumn and Warring States periods, smoke was used during the day (烽), and fire was lit at night (燧). These towers were typically built along the Great Wall. In the vast deserts and Gobi of the Western Regions, where the terrain offered expansive visibility, towering beacon towers were spread across both the northern and southern slopes of the Tianshan Mountains. This also represented the primary form of the Han Dynasty's Great Wall in the Western Regions, serving both to guard the borders and protect the Silk Road. Today, the Kizil Beacon Tower in Kuqa, Xinjiang, stands as one of the remaining Han Dynasty beacon tower ruins preserved to this day.

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4.不同区段的长城扮演着各自不同的角色；
4.1 虎山长城是长城防御系统的东面起点；
如前所述，明长城划分为九镇十一边，最东端的是辽东镇，隶属于辽东镇的虎山长城无疑也就是明长城的起点。辽东地区的长城
同时也是历史上汉长城的东端起点。

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4.2 依山襟海的山海关是名副其实的天下第一关
从辽东镇出发顺着长城南下， 就来到渤海之滨的山海关。 这里是明长城唯一与大海交汇的地方，正因为其南挽渤海、北倚角山，故关城得名山海关。明朝洪武年间在此筑长城山海关山海关城呈不规则的长方形，“天下第一关”城楼实际是关城的东门镇东门， 一座两层的城楼建在高大的城墙之上，牌匾即悬挂在城楼的屋檐下。城建关，成为扼东北、华北咽喉要塞的军事重镇，素有“边郡之咽喉，京师之保障”之称，称为“天下第一关”也名副其实。

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4.3 戍守关沟北口的八达岭长城拱卫京畿皇城
如果说山海关长城守备的是京畿东面的门户，那距离皇城数十里外的居庸关无疑是扼守京城西北的雄关险隘，再穿过数十里的关沟，雄镇北口的八达岭长城素有居庸之险所在的精妙之论。

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八达岭长城北四楼
八达岭北峰长城中，有一座敌楼最为独特，在临近的敌楼中占据了最高也是最有利的位置，呈居高临下的态势。敌楼南面连接的城墙有一处270度的转角，这是为了解决在较短的距离内城墙急速爬升的精巧设计，也更凸显了敌楼的高大伟岸。这座敌楼就是北四楼。

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4.4 镇北台顾名思义威震北方疆域
长城是一个以城墙为主体，建有敌楼、关城、烽火台等功能性建筑的防御体系，在一些特定位置还修建有军事观察所，用于监视敌人动向。在长城一直往西延伸的延绥镇内，就有这样一座日常用于监控明长城沿线贡市的情况，也见证了长城不仅是分割的界墙，而是交流的关口。这处观察所就是镇北台。

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4.5 长城防御系统的西面终点设在遥远的嘉峪关
长城这样横亘在中国版图北部的巨大城墙，东面有天下第一关的山海关，西面就应该有远在大漠深处的天下第一雄关嘉峪关，两座关城隔着数千里，所发挥的作用却是极其相似，无外乎是扼守咽
喉要道。

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