History of the Peloponnesian War
Thucydides
Thucydides. The history of the Peloponnesian War, Volume 1-2. Dale, Henry, translator. London: Heinemann and Henry G. Bohn, 1851-1852.
But the Messanians, and some Locrians with Demoteles, who after its disaster had been left in it as a garrison, suddenly fell upon them, and routed the greater part of the Leontine troops, and slew many of them. The Athenians, on seeing it, landing from their ships, went to their assistance, and drove the Messanians back again into the town, having come upon them while in confusion; they then erected a trophy and returned to Rhegium.
After this, the Greeks in Sicily continued to make war on each other by land without the co-operation of the Athenians.
At Pylus, in the mean time, the Athenians were still blockading the Lacedaemonians in the island, and the Peloponnesian forces on the continent remained where they were. But the watch was kept by the Athenians with great trouble, through want of both victuals and water;
for there was no spring but one in the citadel of Pylus itself, and that not a copious one; but most of them were drinking such water as they would be likely to find by digging through the shingle near the sea. They suffered too from want of room, being encamped in a narrow space;
and as the ships had no roadstead, some of them took their meals on shore in their turn, while others lay off at anchor. But their greatest discouragement was caused by the time being prolonged beyond their expectation;