《尉缭子·踵军令》
所谓踵军，通常与大军相距约一百里，按期到达会战地点，它应携带三天干粮，在大军的前面行进，还要预先规定好行动的信号，接到信号后就开始行动。
所谓踵军者，去大军百里，期于会地，为三日熟食，前军而行。
The so-called “zhong jun”, usually keep a distance of about one hundred miles away from the main army, arriving at the battlefield of the decisive battle on schedule; they need to bring three days of dry food rations, march in front of the main force. Also need to decide on a signal for action beforehand, start to act upon receiving the signal.