《孙膑兵法·擒庞涓》
我军攻打平陵，平陵南面是宋国，北面是卫国，进军途中还要经过魏国的市丘，我军的运粮通道很容易被切断。
吾攻平陵，南有宋，北有卫，当途有市丘，是吾粮途绝也，吾将示之不知事。 
If our army attacks Pingling, Song is to the south of Pingling, and Wei is to the north. On the way to the march, we must also pass Shiqiu in Wei. Our army's grain transportation route is easy to be cut off.