History of the Peloponnesian War

When they had come to close combat, they withstood each other's attacks for a long time. And there happened to come on at once both thunder, and lightning, and heavy rain: so that to those who were fighting for the first time, and had had very little acquaintance with war, even this helped to increase their fear; while to the more experienced party these occurrences appeared to be produced simply by the season of the year, but the fact of their opponents not being defeated caused far greater alarm.

But when the Argives had first driven in the left wing of the Syracusans, and after them the Athenians had repulsed those opposed to them, the rest of the Syracusan army was now also broken and put to flight.