By luring Yuan Shao far south into Guandu , Cao Cao had forcibly extended Yuan Shao 's supply lines .
Was thus able to pounce on Cao Cao 's logistical disadvantage to gain a decisive victory .
By luring Yuan Shao far south into Guandu , Cao Cao had forcibly extended Yuan Shao 's supply lines and was thus able to pounce on his logistical disadvantage to gain a decisive victory .