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the expediency of aggressive or defensive tactics; and the

fundamental laws of human nature: these are things that must most

certainly be studied.

42. When invading hostile territory, the general principle is,

that penetrating deeply brings cohesion; penetrating but a short

way means dispersion.

[Cf. supra, § 20.]

43. When you leave your own country behind, and take your army

across neighbourhood territory, you find yourself on critical

ground.