The image of isolated city often appears in frontier fortress poems.

Frontier poetry is a peak of pastoral poetry in the prosperous Tang Dynasty, and its image is generally related to frontier life, scenery and war. Common images, such as lonely city and Yumenguan, are often combined into frontier fortress in poetry. "The desert in autumn is full of grass and flies, and a few surviving observers are lonely by the wall in the sunset." (Gao Shi's Ge Yanxing) "The Yellow River is far above the white clouds, and the lonely city is covered with Wan Ren Mountain. Why bother to complain about the willow, the spring breeze is only Yumenguan. " (Wang Zhihuan's "Liangzhou Ci") "Qinghai Yunchang Snow Mountain is dark, and the lonely city looks at Yumenguan." (Wang Changling's "Joining the Army") "And the wind has reached a thousand miles, knocking at Yumenguan battlements." Guan Shanyue in Li Bai's works.

Frontier poems are gloomy and gloomy in tone, magnificent or bleak in artistic conception and low in emotional rhythm. Through these images to express their thoughts and feelings, their ideological content is extremely rich: they can express their lofty sentiments eager to make contributions and serve the country; You can write about the homesickness of border guards and the hatred of missing women at home; Can show the monotony and hardship of life beyond the Great Wall, as well as the cruelty of years of war; You can vent your dissatisfaction with the opening of the border and your resentment against the greed of the general; You can marvel at describing the strange scenery and folk customs of the frontier, so the expression content is extremely rich.

ancient city

Frontier fortress