The Art of War by active 6th century B.C. Sunzi

38. When envoys are sent with compliments in their mouths, it is a sign

that the enemy wishes for a truce. [Tu Mu says: "If the enemy open friendly relations be sending hostages, it is a sign that they are anxious for an armistice, either because their strength is exhausted or for some other reason." But it hardly needs a Sun TzÅ­ to draw such an obvious inference.]