Around 196, when Zhou Yu was nominally serving as the Chief () of Juchao County under the warlord Yuan Shu, he wanted to leave Yuan Shu and travel east to the Jiangdong (or Wu) region to join Sun Ce, who had recently conquered some territories in Jiangdong over the past few years. Along the way, Zhou Yu and his militia, numbering a few hundred men, visited Lu Su and requested for supplies. At the time, Lu Su owned two large granaries, each capable of storing 3,000 "hu" of grain. He pointed at one granary and gave it to Zhou Yu. Realising that Lu Su was no ordinary person, Zhou Yu thanked and befriended him. The third-century historian Chen Shou compared their friendship to that of Gongsun Qiao and Ji Zha () during the Spring and Autumn period. The Chinese idiom "pointing at a granary and presenting it" (), which means to generously provide aid to someone, originated from this anecdote.