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The opinion divides into the end of the war background of the Na-Tang war in domestic academic circles and the foreign countries academic circles. It is necessary to confirm the trend of the Tang Dynasty army turned on for the war period to understand the end of the war background of the war more objectively. The Tang Dynasty army participated in the Na-Tang war, and it was predicted, and a leading force participated with sending 100,000 people or more in a Chinese east part. Malgal(靺鞨) to participate in the Na-Tang war is not a cavalryman but an infantryman, and it is necessary to see Li jin-xing(李謹行) in the general absorbed to an administrative system of Tang Dynasty. Therefore, when Li jin-xing moved to the northwest region, a lot of forces in the notheast region did not move. The center of the military strategy of Tang Dynasty was converted in the northwest region in 676 March, year. Because Maeso-seng(買肖城) battle was generated in 675 September, year, it is time that Tang Dynasty attacked. Therefore, Silla army prevented Tang army by not a simple withdrawal combat but this combat as for Maeso-seng battle. Silla Kingdom extended the borders after it fought, and accomplished the target. However, Tang Dynasty gave up the target, and moved backward from the South Korea peninsula.