History of the Peloponnesian War

But Nicias was desirous that the watch which the Athenians kept should be maintained at that point, which would be at closer range for them, instead of at Budorum in Salamis, the purpose of the watch being to prevent the Peloponnesians from using the harbour of Megara as a base from which to send out unobserved either triremes, as they had done once before,[*](Referring to Brasidas' attempt, described 2.93, 2.94.) or expeditions of privateers, and at the same time to see to it that nothing was brought in by sea for the Megarians.

Accordingly, by an attack from the sea he took by means of engines of war two projecting towers—first that on the island opposite Nisaea—and when he had thus cleared the way into the channel between the island and the mainland he walled off also the point on the side toward the mainland, where by a bridge across a morass aid could be brought to the island, which is not far distant from the mainland.[*](This seems to be the sense intended. The passage is very much condensed or corrupt. The two towers seem to have stood on the strait between Minoa and the mainland, one on each side, at the end of dams built out to narrow the strait.)

And when, after a few days, this work was completed, Nicias built a fort on the island also, left a garrison in it, and then withdrew his army to Athens.

During this summer and about the same time, the Plataeans,[*](Resuming the narrative from the end of ch. xxiv.) who were now without food and could endure the siege no longer, surrendered to the Peloponnesians. It happened in the following manner.