Everything is ready, all we need is the outline of Dongfeng's story

Before the Battle of Chibi, Zhou Yu planned to use fire to defeat the enemy. One day when Zhou Yu was inspecting the navy, he suddenly remembered that he could not carry out the fire attack without an east wind. He was so anxious that he fell ill. Zhuge Liang came to visit Zhou Yu and guessed the cause of Zhou Yu's illness, so he wrote on the prescription: "If you want to defeat Duke Cao, you should attack with fire. Everything is ready, all you need is the east wind." Zhou Yu was shocked and asked Zhuge Liang for advice on how to defeat the enemy. Zhuge Liang said that he could use the east wind to defeat the enemy.

Later generations used this metaphor as a metaphor for all preparations being made and waiting for action.