《魏书·帝纪·卷四》
世祖听说刘义隆准备侵犯边境，于是下诏命冀、定、相三州造船三千艘，调集幽州以南守边士卒在黄河边严阵以待。
帝闻刘义隆将寇边，乃诏冀、定、相三州造船三千艘，简幽州以南戍兵集于河上以备之。
When Shizu heard that Liu Yilong was planning to invade the border, he issued an edict ordering the three prefectures of Ji, Ding, and Xiang to build 3, 000 ships, and assembled soldiers from south of Youzhou to await orders on the banks of the Yellow River. 