Chen Tang vs Tian Yu

Chen Tang, as a Han officer, led a punitive expedition against the Xiongnu chieftain Zhizhi Chanyu at his fortress near the Talas River. Despite being outnumbered, Chen Tang's forces stormed the fortress and killed Zhizhi, securing the Han frontier and demonstrating Han military reach into Central Asia.

After the Battle of Zhizhi, Chen Tang reportedly declared that offenders against the Han must be punished no matter how far away they were. This statement became a famous Han policy principle, emphasizing the empire's reach and resolve in dealing with threats.

Tian Yu led Wei forces against the Xianbei tribes raiding the northern frontier. He employed a strategy of building forts and using cavalry to intercept raiders, stabilizing the border region.

Tian Yu defended Yanmen Commandery against a Xianbei invasion. He used a feigned retreat to lure the enemy into an ambush, killing their leader and scattering the tribe. This victory secured the northern frontier for years.

Tian Yu was appointed Governor of You Province, overseeing Wei's northern territories. He implemented policies to integrate non-Chinese tribes into the Wei state, reducing border conflicts through diplomacy and trade.

Tian Yu supported Sima Yi's coup against Cao Shuang. He led troops to secure key positions in the capital, ensuring the success of the coup. This event marked the rise of the Sima family's control over Wei.