《资治通鉴·隋纪·隋纪六》
不出一个月，隋军的军资粮秣都消耗殆尽，隋军不是投降就是溃散，皇帝就可以不战而擒了。这是上计。 
不过旬月，资粮皆尽，其众不降则溃，可不战而擒，此上计也。 
In less than a month, the Sui army's military supplies and fodder will be exhausted, and the Sui army will either surrender or disperse. The emperor will be captured without a fight. This is a good plan.