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[This is the ordinary class of spies, properly so called, forming

a regular part of the army. Tu Mu says: "Your surviving spy must

be a man of keen intellect, though in outward appearance a fool;

of shabby exterior, but with a will of iron. He must be active,

robust, endowed with physical strength and courage; thoroughly

accustomed to all sorts of dirty work, able to endure hunger and

cold, and to put up with shame and ignominy." Ho Shih tells the

following story of Ta'hsi Wu of the Sui dynasty: "When he was

governor of Eastern Ch'in, Shen-wu of Ch'i made a hostile

movement upon Sha-yuan. The Emperor T'ai Tsu [? Kao Tsu] sent

Ta-hsi Wu to spy upon the enemy. He was accompanied by two other

men. All three were on horseback and wore the enemy's uniform.

When it was dark, they dismounted a few hundred feet away from

the enemy's camp and stealthily crept up to listen, until they

succeeded in catching the passwords used in the army.