 After securing his control over the four provinces in northern China, Yuan Shao prepared to wage war against Cao Cao and launch an attack on the imperial capital Xu.Tian Feng and Ju Shou advised Yuan Shao to adopt a slow, steady and step-by-step approach, so as to gradually wear out Cao Cao's forces.However, Yuan Shao heeded the advice of Guo Tu and others instead, and chose to start an all-out war against Cao Cao immediately.