Horn, a wind instrument in the ancient army, is made of animal horns and is also a kind of horn in the ancient army.
Swallowing fat, that is, rouge, here refers to the dusk filled with mud condensed by rouge. The night is purple, showing a deep purple in the twilight. Coagulation, coagulation. Yan Zhi and Purple at Night suggest the bloodiness on the battlefield.
These two sentences describe the gloomy and miserable battlefield atmosphere from both auditory and visual aspects.
It's already late autumn, and all the trees are crumbling. In the dead silence, the horn sounded. Obviously, a thrilling battle is going on. "The sound of trumpets is all over the sky" outlines the scale of the war. With the advantage of numbers, the enemy clamored for progress and pressed forward step by step. The defender didn't get cold feet because of his weakness. Encouraged by the sound of the trumpet, their morale was high and they fought back hard.
The fighting lasted from day to dusk. The poet did not directly describe the fierce scene of hand-to-hand combat in which wheels and wheels were staggered, but only made a rough but expressive description of the scene on the battlefield after the withdrawal of both sides. This gloomy and dignified atmosphere reflects the tragic scene of the battle site, suggesting that both the offensive and defensive sides have a large number of casualties, and the soldiers guarding the city are still at a disadvantage, which has made necessary preparations for the next friendly rescue.
Extended data:
"The horn is ringing all over the sky in autumn, and the night is purple in Yan Zhi" comes from the poem Wild Goose Gate written by Li He, a poet in the Tang Dynasty. The full text of this poem is as follows:
Enemy soldiers rolled in like dark clouds in an attempt to tear down the city wall; Our army was ready, and the sun shone on the armor, glittering with gold. In autumn, the loud bugle sounded; The soldier's blood became dark in the night.
The red flag rolled half, and the reinforcements rushed to Xiao; The night frost is heavy and the drums are gloomy. Just to return the king, sword and death.
Vernacular translation
Enemy soldiers rolled in like dark clouds, trying to destroy the city wall; Because our army is strict, the sun shines on the armor and the golden light flashes.
In autumn, the loud bugles shake the earth; At night, the soldiers' blood coagulated into dark purple.
The red flag is half-rolled, and reinforcements rush to Xiao; The night is frosty and the drums are gloomy.
Just to repay the king's kindness, he held a sword and died.
This poem depicts the tragic battle scene with rich mottled colors, and the strange picture accurately shows the frontier fortress scenery and ever-changing war situation at a specific time and place.
The first couplet is about scenery and things, exaggerating the tense atmosphere and critical situation in Enemy at the Gates, and expressing the majesty of defenders by sunlight; Couplets render the tragic atmosphere of the battlefield and the cruelty of the battle from both auditory and visual aspects; Necklace writing is the scene of a bloody battle of troops at night; The Taiwan Federation quoted allusions and wrote the soldiers' determination to serve the country to the death. The whole poem is desolate in artistic conception and solemn and stirring in style, with strong shock and artistic charm.
References:
Baidu Encyclopedia-Yanmen Taishouhang (Li Heshi)