History of the Peloponnesian War

In the enemy's country indeed men ought always to march with boldness of feeling, but at the same time to make their actual preparations with a degree of fear; for in this way they would be at once most full of courage for attacking their adversaries, and most secure against being attacked.

But in our own case, we are not going against a state that is so powerless to defend itself, but against one most excellently provided with every thing; so that we must fully expect that they will meet us in battle; and if they have not already set out before we are there, yet [that they will do so], when they see us in their territory wasting and destroying their property.

For all are angry, when suffering any unwonted evil, to see it done before their eyes, and in their very presence: and those who [on such provocation] reflect the least, set to work with the greatest passion [to avenge themselves].

And it is natural that the Athenians should do so even to a greater extent than other, since they presume to rule the rest of the world, and to go against and ravage their neighbours' land, rather than see their own ravaged.

As then we are marching against a state of this description, and shall gain for our forefathers, as well as for ourselves, the most decided character, one way or the other, from the results; follow where any one may lead you valuing order and caution above every thing, and with quickness receiving your commands. For this is the finest and the safest thing that can be seen, for a large body of men to show themselves maintaining uniform discipline.