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汉王朝控制河西后,汉武帝为保障边郡的安全,耗费巨大人力、物力在西北边郡设烽燧、置亭障、屯戌卒,构筑了一套行之有效的军事防御体系。据考证,汉代居延边塞设有四道防线。第一道防线为天田。所谓“天田”,就是“以沙布其表,但视其迹,知匈奴来人。”根据居延地区实地考察,在塞墙的外侧,有一道沿塞墙走向伸延,宽3至5米的平坦地带,用细沙填充。它就是天田。除布沙以外,也可利用边塞自然沙地来修制天田。天田有时亦可设置在河边,称“水中天田”,它是利用河岸沙地,侦察过往踪迹。所以,天田是用来侦察敌人袭击和士兵外逃的有效设施,是防卫敌方入侵最外沿的一道防线。
After the Han dynasty controlled Hexi, Han Wudi spent enormous manpower and material resources in order to ensure the safety of Heian-gun and set up a well-established military defensive system. According to research, the Han dynasty lived in Yanbian has four lines of defense. The first line of defense is Amada. The so-called “Amada” is “with Sabu table, but depending on the track, that the Xiongnu come.” According to Juyan area visits, in the outer wall of the plug, there is a wall extending along the wall, 3 to 5 meters wide The flat area, filled with fine sand. It is Amada. In addition to cloth sand, but also the use of natural sand frontier to repair Amada. Amada can sometimes be set up by the river, calling it “Amakusa”. It uses the sand bank of the riverbank to scout past traces. Therefore, Umeda is an effective facility for reconnaissance of enemy attacks and soldiers fleeing. It is also a defensive line that defends the outermost edge of enemy invasion.