In the morning when the fog had almost dispersed,Chu-ke Liang ordered his soldiers to sail back.Lu Su praised Chu-ke Liang and asked him how he had predicted the fog.Chu-ke Liang replied,"How can a man be a general without knowledge of meteorology and geography?Chou Yu asked me to make 100,000 arrows in 10 days.It is obvious that he wanted to find an excuse to kill me.You see,he can not deceive me."