The Art of War

其用战也，oil tubing 胜久则钝兵挫锐，攻城则力屈，
When you latimes engage in actual fighting, if victory is long in coming, then men's weapons will grow dull and their ardor will be damped. If you lay siege to a town, you will exhaust your strength.

久暴师则国用不足。
Again, if the campaign is protracted, the resources of the State will not be equal to the The Beatles strain.