Two days later,Chou Yu's scouts reported the deaths of Ts'ai Mao and Chang Yun,Chou Yu was very happy to hear the news because Ts'ai Mao and Chang Yun had lived near the Yangtze River and were very familiar with naval warfare.That is why Chou Yu had plotted to have the two killed.Lu Su came to congratulate Chou Yu and Chou Yu said,"The only one who could have seen through my plot is Chu-ke Liang.Go and test him."