Summarize the battle of the ladle in a few words.

In the battle of Changshao in Qilu, Duke Zhuang of Lu listened to Cao Gui's correct operational command with an open mind, followed the policy of taking the initiative in the rear, pursuing hard, actively focusing on defense, and fighting back in time, correctly chose the battlefield, correctly grasped the opportunity of fighting back and pursuing, firmly grasped the initiative of the war, and achieved a major victory in the battle.