This poem sings an ancient theme of life-to serve the monarch, to save the country from disaster, and to die for a confidant. Du Fu was quoted in Poems of the Middle and Late Tang Dynasty: "This poem says that the city is in danger and its armor is inexhaustible. As for the mourning, the sunset glow is purple, everywhere sad, still in the forefront, there is no way out. Although the morale of the army is exhausted, the drums are not beaten, but the sword is still there, and it will not live up to the country. They all say "loyalty and generosity". "Since the Anshi Rebellion in the Tang Dynasty, border wars have occurred from time to time, and the war written in the poem refers to a certain time and place. There is also a saying that "a lamp shines on the sun", so the time of war is day and night. In any case, it must be extremely tragic and tragic. It's a bit like Qu Yuan's "Guo Shang", which is not about victory but about failure. In the tragic defeat, it eulogized the heroic spirit of the soldiers fighting bloody battles and dying. At the same time, it also expressed the poet's own desire to make contributions to the monarch and the country.
Lu You said, "Congratulations are like a hundred flowers with dazzling colors." This poem uses rich colors such as black, yellow (gold), red, white and purple to describe intense and tragic battle scenes. The color contrast is large, and the contrast is very clear and strong, which complements the tragic mood in the poem.
Li He likes to use strange colors in his poems, such as shades, heavy colors, bright colors and variegated colors. For example, he wrote green: cold green, decadent green, silk green, condensed green and static green; Writing red includes: smiling red, cold red, worrying red and old red; Ghost lights write "paint", ghost fires write "green", candlelight writes "cold green", and so on.