In the late Tang Dynasty, wars often occurred in border areas, and some neighboring ethnic minorities often provoked and launched wars. In this context, Wang Changling, a famous frontier poet in the Tang Dynasty, wrote "Out of the Frontier", which expressed his patriotism and determination to defend the motherland's territory and national security. The Fortress was written by Wang Changling on his way to Xirong. As a frontier general, Wang Changling vividly demonstrated the bravery and good fighting of the border guards through these two poems, and even expressed his love for the country, his feelings for the war and his sympathy for the working people as soldiers.
The poet starts with the scenery, and the first sentence outlines a desolate scene of Leng Yue's filming the border crossing. "Bright Moon in Qin Dynasty, Customs in Han Dynasty" refers to the bright moon and customs in Qin and Han Dynasties. The poet hinted that the war here has never stopped since Qin and Han dynasties, highlighting the long time. It shows a broad, empty and sad sense of history, and creates an open space and a distant time for the next sentence "People did not return on the Long March". It is in such a long time and vast space that generations of conscripts and soldiers gave their lives and shed their blood on the border under the bright moon. This has a heavy feeling of seeing through history and reality.
"People who have not returned from the Long March" and "Wan Li" mean that the frontier fortress and the mainland are far from Wan Li. Although it is fictional, it highlights the vast space. The Return of Man reminds people of the disaster brought by the war and expresses the poet's grief and indignation. How can we get rid of people's difficulties? The poet pinned his hopes on a brilliant general. "But make Longcheng fly, and don't teach Huma to cross the Yinshan Mountain." As long as Li Guang, the flying general guarding Liuzhou, is still alive, he won't let the Hu people's cavalry cross the Yinshan Mountain. The author's feelings about history may be that he is nostalgic for the past and hurts the present, because the generals are not able to defend the border in reality; Perhaps it is only because of the battles of past dynasties and the bright moon on the border that the historical lament rises.