S1·E23 Episode 23 The Arrow Borrowing

Zhou Yu deliberately proposes to make 100,000 arrows in ten days. The wise Zhuge Liang recognizes at once that it is a harmful scheme, but calmly says "it only takes three days". Later, with the help of a foggy day, Zhuge Liang takes advantage of Cao Cao's suspicious nature and transfers several straw boats to lure the enemy, finally borrowing 100,000 arrows and achieving a miraculous success.