Again, if the campaign is protracted, the resources of the State will
not be equal to the strain.
久暴師 means literally, “If there is long exposure of the army.”
Of 暴 in this sense K‘ang Hsi cites an instance from the biography
of 竇融 Tou Jung in the _Hou Han Shu_, where the commentary defines
it by 露. Cf. also the following from the 戰國策: 將軍久暴露於外
“General, you have long been exposed to all weathers.”