What are the ancient patriotic folk stories?

Yue Fei faithfully served the country, Su Wu shepherded sheep, etc.

Yue Fei's loyalty to the country: Yue Fei, a famous anti-gold star in the Southern Song Dynasty, was stabbed to death in his back by his mother-in-law in order to motivate him to be loyal to the country. He really lived up to expectations and made great achievements in killing the enemy for the country many times. Later, he was killed by traitors, but he finally became a national hero.

Su Wu Shepherd: Su Wu, an envoy of the Western Han Dynasty, was sent to Xiongnu and was detained on suspicion of assassinating Khan. Never giving in, he tried to kill himself and was sent to herd sheep. Khan said that the ram was not allowed to come back until he gave birth to a lamb. Nineteen years later, during the reign of Emperor Zhao of Han Dynasty, Su was released, but the scepter was not lost.