After Xu Shu has left, on the 15th day of winter, Cao Cao invites his civil and military officials on a banquet to celebrate the moon festival, commonly known as “Moon Right Above” festival. Cao Cao comments on the advantages of scheme of connecting the boats. The two advisers, Chen Yu and Xun You, admonish Cao Cao from doing this. Even though connecting the boats could have some advantages on the water, fire would be extremely dangerous. Cao Cao laughs loudly, saying that they seem bright, but are not. “If Zhou Yu should set our boats on fire, he would need a south-eastern wind. Now it is winter, and naturally no wind blows from the south east. If this was in the spring next year, I would of course not interlock the boats.” Cao Cao’s words render the two men speechless.
徐庶走後，冬月十五曹操請文武官員連環官坐，擺酒慶賞月夕節，俗稱月當頂。曹操贊連環之妙。孫昱、荀攸二謀士進諫曹操，連環船純利在水，不利在火。曹操大笑，說二人通而不通。周瑜如