Battle of Guandu
One of the most powerful warlords of his time, Yuan Shao spearheaded a coalition of warlords against Dong Zhuo, who held Emperor Xian hostage in the imperial capital, Luoyang, but failed due to internal disunity. In 200, he launched a campaign against his rival Cao Cao but was defeated at the Battle of Guandu. He died of illness two years later in Ye. His eventual failure despite his illustrious family background and geographical advantages was commonly blamed on his indecisiveness and inability to heed the advice of his advisors.