“Analysis of Chinese Characters by bilingual”，is opened for the convenience of Chinese and foreign friends who are interested in Chinese characters. We’ll push a Chinese character every Monday，analyze its originand related culture. If there is any impropriety，welcome to correct us.
The east is the direction where the sun rise every day. The ancients observed the sun(日)through the trees(木).So sun(日)behind tree(木)became east(東).
All That Is Needed Is An East Wind
In the winter of 208 Cao Cao(曹操) led a large army on a southern campaign.The allied armies of Sun Quan(孙权)and Liu Bei(刘备) were massed on the south bank of the Yangtze River. They planned to attack the warships of Cao Cao with blazing barges. When all the preparations for the attack were completed, they called to mind that the wind in winter always blew from the northwest, and so would blow the fire barges back toward their own ships. So an east wind was needed for the attack. Zhuge Liang(诸葛亮),the chief advisor of Liu Bei, said that he could summon an east wind, and he did so by his ability to divine the unknown. The result was that Cao Cao’s ships were burnt to ashes.
Later,“Everything is ready, and all that is needed is an east wind” came to be used to describe a situation in which all is ready except what is crucial for the fulfilment of an undertaking.