Zhuge Liang was asked by Chou Yu to obtain 100,000 arrows within a ridiculous time limit. He got a number of boats, stacked them with straw dummies and went in the fog across the river to Tsao Tsao's naval base. His boats made a lot of noise as it approached the base. Tsao Tsao, fearing the fog could serve as a trap for his naval fleet commanded that arrows be shot from the naval base, at the enemy boats of Zhuge Liang, without sending out his fleet. Due to the fog, Zhuge was able to collect more than a hundred thousand arrows in time to deliver to Chou Yu.