If in the neighborhood of your camp 460 there should be any hilly country, 461 ponds surrounded by aquatic grass, hollow basins filled with reeds, 462 or woods with thick undergrowth, 463 they must be carefully routed out and searched; for these are places where men in ambush or insidious spies are likely to be lurking. 464

When the enemy is close at hand and remains quiet, he is relying on the natural strength of his position. 465

When he keeps aloof and tries to provoke a battle, he is anxious for the other side to advance. 466