A second devastation of Attica was resolved upon for the commencement of spring; and measures were taken for carrying it all over that territory, since the settled policy of Athens not to hazard a battle with the invaders was now ascertained. About the end of March, or beginning of April, the entire Peloponnesian force—two-thirds from each confederate city, as before—was assembled under the command of Archidamus, and marched into Attica. This time they carried the work of systematic destruction, not merely over the Thriasian plain and the plain immediately near to Athens, as before; but also to the more southerly portions of Attica, down even as far as the mines of Laurium. They traversed and ravaged both the eastern and the western coast, remaining not less than forty days in the country. They found the territory deserted as before, all the population having retired within the walls.[271] [271] Thucyd. ii, 47-55. In regard to this second invasion, Periklês recommended the same defensive policy as he had applied to the first; and, apparently, the citizens had now come to acquiesce in it, if not willingly, at least with a full conviction of its necessity. But a new visitation had now occurred, diverting their attention from the invader, though enormously aggravating their sufferings. A few days after Archidamus entered Attica, a pestilence, or epidemic sickness, broke out unexpectedly at Athens. It appears that this terrific disorder had been raging for some time throughout the regions round the Mediterranean; having begun, as was believed, in Æthiopia,—thence passing into Egypt and Libya, and overrunning a considerable portion of Asia under the Persian government: about sixteen years before, too, there had been a similar calamity in Rome and in various parts of Italy. Recently, it had been felt in Lemnos and some other islands of the Ægean, yet seemingly not with such intensity as to excite much notice generally in the Grecian world: at length it passed to Athens, and first showed itself in the Peiræus. The progress of the disease was as rapid and destructive as its appearance had been sudden; whilst the extraordinary accumulation of people within the city and long walls, in consequence of the presence of the invaders in the country, was but too favorable to every form of contagion. Families crowded together in close cabins and places of temporary shelter,[272]—throughout a city constructed, like most of those in Greece, with little regard to the conditions of salubrity,—and in a state of mental chagrin from the forced abandonment and sacrifice of their properties in the country, transmitted the disorder with fatal facility from one to the other. Beginning as it did about the middle of April, the increasing heat of summer farther aided the disorder, the symptoms of which, alike violent and sudden, made themselves the more remarked because the year was particularly exempt from maladies of every other description.[273]