译文及注释：
Translation:
Emergency recruitment documents came from the border outpost and news of the outbreak of war had reached the capital. The recruited cavalry stationed in Guangwu County dividing their forces to rescue the trapped soldiers in Shuofang. Although the autumn of slaughter was extremely cold the soldiers' fighting spirit was not weakened at all and their bows and arrows became even stronger. However the enemy's battle formation was also elite and strong. When the emperor heard the news of the enemy's arrogance he couldn't suppress his anger and personally fought against the enemy on the battlefield. The war was extremely intense with messengers constantly coming and going to deliver military information. The army marched along the stone path like a formation of flying geese; the soldiers crossed the bridges one by one like swimming fish connected in a row. The military music revealed the sentiments of the Han people and the soldiers' banners and armor were covered with the frost and snow of the northern lands. They charged into battle against the strong winds and the gravel on the battlefield was lifted and carried by the wind. Because of the cold weather the horse's hair curled up like a hedgehog and the bowstring couldn't be pulled open. But it is only in dangerous times that one can see the integrity of those officials; it is only in times of chaos that one can see whether a person is loyal and righteous. The soldiers fought and sacrificed their lives in order to repay the grace of their ruler. After their death they would become glorious martyrs who sacrificed themselves for the country.
Annotations:
Daichu Zì Jì Běi Mén Xíng is an old title of Yuefu belonging to the category of miscellaneous songs. This poem portrays the heroic ambition and passion of soldiers who join the army to defend their country through the depiction of urgent military affairs and the harsh environment of the border. Ji the ancient capital of the Yan Kingdom is now southwest of Beijing.
Yuxi: An urgent military document in ancient times. Bianting: An outpost on the border.
Fenghuo: Smoke signals used to alert the border defense. In ancient times when the border defense discovered enemy movements they would light up the fenghuo on high platforms to sound the alarm. Xianyang: The name of a city Qin once made it the capital used here to refer to the capital city.
Zhengshi: The troops that were conscripted. Also written as Zhengqi. Tun: To station troops for defense. Guangwu: A place name now located in the west of Daixian Shanxi Province.
Shuofang: A Han dynasty prefecture located in the northwest of the current Inner Mongolia Autonomous Region including the Hexi region.
Yanqiu: The autumn of slaughter. This sentence means that the bowstring and arrow shaft have become strong and powerful due to the dryness of late autumn.
Luzhen: Refers to the enemy's formation. Lü is an ancient derogatory term for the northern invading ethnic groups.
Tianzi Anjian Nu: Refers to the emperor's anger upon hearing the warning.
Shizheju: It means that the military situation is urgent messengers are running on the road and they can see each other from a distance.
Yanxing: Neatly arranged in order like the formation of geese.