Chapter 7, Verses 7 and 8 - Sun Tzu

Thus, if you order your men to roll up their buff-coats, and make forced marches without halting day or night, covering double the usual distance at a stretch, doing a hundred LI in order to wrest an advantage, the leaders of all your three divisions will fall into the hands of the enemy. The stronger men will be in front, the jaded ones will fall behind, and on this plan only one-tenth of your army will reach its destination.
~ from The Art of War, Giles translation ~

Go here to read the introductory post to the verses of The Art of War.