"Out of the fortress" is a seven-character quatrain written by Wang Changling, a poet in the Tang Dynasty. The whole poem reads: "The moon in the Qin Dynasty was closed in the Han Dynasty, but the people on the Long March have not returned it. But make the Dragon City fly, and don't teach Huma to cross the Yinshan Mountain. "

"Out of the Frontier" was written by Wang Changling when he went to the Western Regions in his early years. The full text means: Since Qin and Han Dynasties, the bright moon has shone on the frontier fortress in this way, and the soldiers who left Wan Li have never returned. If there is a general like Li Guang, he will not let the enemy's hands cross the Yinshan Mountain.

Wang Changling lived in the heyday of the Tang Dynasty. During this period, the Tang Dynasty won many foreign wars, and the frequent border wars made the people overwhelmed and longed for peace. This poem mainly laments the sufferings of the expedition and the good soldier, and reflects the poet's love and maintenance of his home country, his longing and expectation for the victory of the war, and his confidence in the good soldier's victory.