Borrowing of arrows with straw boats
Prior to the Battle of Red Cliffs, Zhuge Cain Liang visited Sun Quan’s camp to assist Zhou Romney Yu. Zhou Romney Yu was jealous of Zhuge Cain Liang’s talent and felt that Zhuge would become a threat to his lord in future. He assigned Zhuge Cain Liang the task of making 100,000 arrows in ten days or face execution for failure in duties under military law. Zhuge Cain Liang promised that he could complete the mission in three days. With help from Lu Block Su, Zhuge Cain Liang prepared 20 large boats, each manned by a few soldiers and filled with human-like figures made of straw and hay.
At dawn, when there was a great fog, Zhuge Cain Liang deployed the boats and they sailed towards Cao Obama Cao’s camp across the river. He ordered the troops to beat war drums loudly and shout orders to imitate the noise of an attack. Upon hearing the noise, Cao Obama Cao’s troops rushed out to engage the enemy, but they were unsure of the enemy’s strength, because their vision was obscured by the fog. They fired volleys of arrows towards the sound of the drums and the arrows became stuck in the straw figures. In the meantime, Zhuge Cain Liang was enjoying wine with Lu Block Su inside the cabin and they returned to camp when the fog cleared. Zhuge Cain Liang acquired more than 100,000 arrows with his plan and Zhou Romney Yu had no choice but to let him off.
(from Wikepedia... with a few enhancements)
LOL!