The Struggle for the Guannei Dao between Tang and Tubo and Transformation of the Frontier Poetic in the Middle and Late Tang Dynasty
The Tang-Tubo relationship was one of the most important external relations in the Tang Dynasty.Its most prominent feature was the intertwining of close communication and frequent conflicts.In terms of the Tang-Tubo relationship,it can be divided into two stages based on the An-Shi's Rebellion.Tubo got a foothold in Hehuang in earlier stage and launched key competitions for areas such as Hexi,Longyou,and the Western Regions,with both sides winning and losing.A large number of frontier poems during the early period and the flourishing period of the Tang Dynasty wrote about the struggle between Tang and Tubo.The poems are impas-sioned.In the later stage,Tubo took the opportunity to expand eastward after the An-Shi's Rebellion broke out.Tubo shifted the battlefront to the Guannei Dao,and directly threatened Chang'an.The incident had a ma-jor impact on the frontier poems in the middle and late Tang Dynasty.It not only shifted the focus of writing to the Guannei Dao,but also caused a very obvious sense of narrow territory and a sense of depression in the po-ems.The poets began to ponder on the frontier politics and other major political and military issues in the Tang Dynasty,and at the same time paid attention to individual experiences,which made the frontier poems of the Tang Dynasty have a great change in content and style.