Yang Su, born in an official family, whose grandfather was the general of the Western Wei and his father was the governor of Fenzhou in the Northern Zhou. He was diligent in studying since childhood, proficient in classic books, good at calligraphy and writing excellent articles. The Emperor Wu of the Northern Zhou once asked him to draft an edict, and he finished it immediately with excellent writing, which greatly impressed the emperor.

Despite Yang Su's outstanding literary talent, his military talent was even more prominent. He had developed plans for Emperor Yang Jian of the Sui Dynasty to pacify the Southern Chen several times, organized an unprecedented naval fleet in history, and built the "Five-toothed" warship that was five stories high and carried 800 soldiers. In a short time, Yang Su's naval force swept away the navy of the Southern Chen, leading to its immediate downfall. After the Sui army occupied the south of the Yangtze River, rebellions broke out, and Yang Su again led the troops to suppress the rebellions. Yang Su played a significant role in the unification of China by the Sui Dynasty.

After the completion of the unification of China by the Sui Dynasty, Emperor Yang Jian divided his troops into three routes to launch a major counterattack against the Turks in the north. Yang Su, as the commander of one of the routes, led well-trained cavalry forces and targeted combat plans, successfully defeating the Turk cavalry and making them lose their aggression. Subsequently, Yang Su supported puppets, causing the Eastern Turk Khanate and the Western Turk Khanate to compete with each other.

In addition to his military talents, Yang Su also had a keen sense of politics and never stood on the wrong side at critical moments. Before Yang Jian usurped the throne of the Northern Zhou, Yang Su proactively aligned himself with him, advising and charging ahead for Yang Jian. When Yang Jian's sons competed for the throne, Yang Su early on made friends with Yang Guang and made significant contributions to his ascent to the throne.

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