Yuan Shao died two years later and his youngest son Yuan Shang was made his successor .
Cao Cao 's victory at the Battle of Guandu was a decisive one and marked the turn of the tide in his struggle for power with Yuan Shao .
Yuan Shao died two years later and Cao Cao 's youngest son Yuan Shang was made his successor .
Cao Cao 's victory at the Battle of Guandu was a decisive one and marked the turn of the tide in his struggle for power with Yuan Shao .