History of the Peloponnesian War

Harmodius being very indignant at this, Aristogiton also was, for his sake, much more exasperated than ever. And now all their other arrangements had been made with those who were to join them in taking the business in hand; but they were waiting for the great Panathenaic festival, on which day alone it was not considered a suspicious circumstance that those of the citizens who had conducted the procession should meet together in arms; and they were themselves to begin, but the rest immediately to join in aiding them against the body-guards. The conspirators were not numerous, for security's sake;

for they hoped that if any number whatever dared to make the attempt, even those who were not before privy to it would be willing at the moment, inasmuch as they had arms in their hands, to join in effecting their own freedom.

When therefore the festival arrived, Hippias, with his body-guard, was arranging outside of the walls, in what is called the Ceramicus, how the several parts of the procession were to proceed.

And when they saw one of their accomplices in familiar conversation with Hippias, (for he was easy of access to all,) they were alarmed, and thought that some information had been laid against them, and that they would be almost immediately arrested. They wished therefore to avenge themselves beforehand, if possible, on the man who had aggrieved them, and for whose punishment they were exposing themselves to all that danger;