History of the Peloponnesian War

They marched in the form of a hollow square, the division under Nicias taking the lead, and that of Demosthenes following;

while the baggage bearers and the main crowd of camp followers were enclosed within the heavy-armed. When they had come to the ford of the river Anapus, they found drawn up at it a body of the Syracusans and allies; but having routed these, and secured the passage, they proceeded onwards; while the Syracusans pressed them with charges of horse, as their light-armed did with their missiles.