The Persian galleys that had been sent forward having taken the three Greek guard-ships, and finding the sea before them now clear of all appearances of an enemy, concluded to return to the fleet with their prizes and their report. They had been directed, when they were dispatched from the fleet, to lay up a monument of stones at the furthest point which they should reach in their cruise: a measure often resorted to in similar cases, by way of furnishing proof that a party thus sent forward have really advanced as far as they pretend on their return. The Persian detachment had actually brought the stones for the erection of their landmark with them in one of their galleys. The galley containing the stones, and two others to aid it, pushed on beyond Sciathus to a small rocky islet standing in a conspicuous position in the sea, and there they built their monument or cairn. The detachment then returned to meet the fleet. The time occupied by this whole expedition was eleven days. The fleet was, in the mean time, coming down along the coast of Magnesia. The whole company of ships had advanced safely and prosperously thus far, but now a great calamity was about to befall them--the first of the series of disasters by which the expedition was ultimately ruined. It was a storm at sea. The fleet had drawn up for the night in a long and shallow bay on the coast. There was a rocky promontory at one end of this bay and a cape on the other, with a long beach between them. It was a very good place of refuge and rest for the night in calm weather, but such a bay afforded very little shelter against a tempestuous wind, or even against the surf and swell of the sea, which were sometimes produced by a distant storm. When the fleet entered this bay in the evening, the sea was calm and the sky serene. The commanders expected to remain there for the night, and to proceed on the voyage on the following day.