In the foreign wars in Tang Dynasty, many literati participated in them, had personal experience of frontier fortress and military life, obeyed the army instead of writing, wrote poems to describe the desolate frontier fortress scenery, praised the brave spirit of soldiers, or cursed the disasters brought about by the war, so frontier fortress poets came into being.
Du Fu's "Three Officials and Three Farewells";
Take Li Xinan as an example.
The guests went to Xin 'an Road and shouted for some soldiers.
Excuse me, Xin 'an: Is the county still smaller?
Last night, the government selected the male line.
China men are absolutely short, so why should they guard the city?
The fat man is from his mother, and the thin man is alone.
White water flows eastward at dusk, and Qingshan is still crying.
Don't let your eyes dry, collect your tears.
Dry eyes see bones, and heaven and earth are ruthless.
Our army takes Xiangzhou and watches it every day.
You never know what a thief is, but a military star will leave the camp.
As far as food is concerned, the soldiers are still in Beijing.
If you can't dig trenches, the horse herding service is also light.
The situation is Wang Shishun, and his upbringing is very clear.
Don't cry when you send me. Servants shoot like fathers and brothers.