13. The Use of Spies
Sun Tzu said: Raising a host of a hundred thousand men and marching them great distances entails heavy loss on the people and a drain on the resources of the State. The daily expenditure will amount to a thousand ounces of silver.
Cf. II. ss. 1, ss. 13, ss. 14.
Cf. TAO TE CHING, ch. 30: "Where troops have been quartered, brambles and thorns spring up. Chang Yu has the note: "We may be reminded of the saying: 'On serious ground, gather in plunder.' Why then should carriage and transportation cause exhaustion on the highways?—The answer is, that not victuals alone, but all sorts of munitions of war have to be conveyed to the army. Besides, the injunction to 'forage on the enemy' only means that when an army is deeply engaged in hostile territory, scarcity of food must be provided against. Hence, without being solely dependent on the enemy for corn, we must forage in order that there may be an uninterrupted flow of supplies. Then, again, there are places like salt deserts where provisions being unobtainable, supplies from home cannot be dispensed with."
Mei Yao-ch`en says: "Men will be lacking at the plough tail." The allusion is to the system of dividing land into nine parts, each consisting of about 15 acres, the plot in the center being cultivated on behalf of the State by the tenants of the other eight. It was here also, so Tu Mu tells us, that their cottages were built and a well sunk, to be used by all in common. [See II. ss. 12, note.] In time of war, one of the families had to serve in the army, while the other seven contributed to its support. Thus, by a levy of 100,000 men (reckoning one able bodied soldier to each family) the husbandry of 700,000 families would be affected.