History of the Peloponnesian War
Thucydides
Thucydides. History of the Peloponnesian War. Crawley, Richard, translator. London and Toronto: J. M. Dent and Sons Ltd.; New York: E. P. Dutton and Co., 1914.
But the plan of attack that I propose to pursue, this it is as well to explain, in order that the fact of our adventuring with a part instead of with the whole of our forces may not damp your courage by the apparent disadvantage at which it places you.
I imagine it is the poor opinion that he has of us, and the fact that he has no idea of any one coming out to engage him, that has made the enemy march up to the place and carelessly look about him as he is doing, without noticing us.
But the most successful soldier will always be the man who most happily detects a blunder like this, and who carefully consulting his own means makes his attack not so much by open and regular approaches, as by seizing the opportunity of the moment;
and these stratagems, which do the greatest service to our friends by most completely deceiving our enemies, have the most brilliant name in war.
Therefore, while their careless confidence continues, and they are still thinking, as in my judgment they are now doing, more of retreat than of maintaining their position, while their spirit is slack and not high-strung with expectation, I with the men under my command will, if possible, take them by surprise and fall with a run upon their center;