Both forces had halted at Ch'ihpi(Red Cliff) on the Yangtze River.For more than a month,they faced each other across the river.Ts'ao Ts'ao became increasingly anxious and called his civil and army officials together.His adviser Chiang Kan said,"I was once Chou Yu's schoolmate.I want to go to Wu Kingdom and try to persuade Chou Yu to change his mind.I am sure I can convince Chou Yu to surrender to us."