《资治通鉴·唐纪·唐纪十一》
如今唐朝派军队来攻伐，发兵多则粮草供应不上，三万以内的兵力我们足能对付他们。
今来伐我，发兵多则粮运不给；三万已下，吾力能制之。
Now that the Tang Dynasty has sent troops to attack us, if they send too many troops, they will not be able to supply them with food, and we will be able to deal with them with an army of less than 30,000.