What does it mean that Wang Changling's title is "Joining the Army" in the ancient Chinese poems in the third grade of primary school?

Joining the army [cóng jūn xíng] means: the old topic of Yuefu, and the content is mostly military warfare.

source

Wang Changling in "Joining the Army" in Tang Dynasty

original text

There is a dark snow-capped mountain in Qinghai, with long white clouds and a lonely city looking at Yumenguan.

Yellow sand wears golden armor in hundreds of battles, but the loulan is not returned.

translate

Qinghai Lake is covered with dark clouds, and the continuous snow-capped mountains are bleak. Yumen, the ancient city of frontier fortress, is a grand pass, thousands of miles away, facing each other from afar.

The soldiers guarding the border have been through many battles, their armor is worn out, their ambitions are immortal, and they will never return to their hometown until they defeat the invading enemy.

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This poem borrows the title "Joining the Army" from the old Yuefu and describes the whole process of a scholar joining the army and fighting. There are only forty words, which not only reveal the psychological activities of the characters, but also render the environment and atmosphere, and the brushwork is extremely vigorous.