The business of a general is to kick away the ladder behind soldiers when they have climbed up a height.
Sun TzuWhen a general, unable to estimate the enemy's strength, allows an inferior force to engage a larger one, or hurls a weak detachment against a powerful one, and neglects to place picked soldiers in the front rank, the result must be rout.
Sun TzuAnd therefore those skilled in war bring the enemy to the field of battle and are not brought there by him.
Sun Tzu