a want arising probably from their national poverty; for the ram was known, and was employed, some say invented, by Pericles, at the siege of Samos, some years before the Peloponnesian war broke out. It is remarkable that from this time downwards to the invention of gunpowder, no material discovery was made in this branch of the military art, except the introduction of moving towers. Lines of circumvallation, as they were the earliest, continued to be the surest means of overcoming the pertinacious resistance of stone and mortar. Such was the case even at Rome, after the vast influx of wealth from conquered provinces had facilitated the construction of the largest and most expensive machines; and the vast scale upon which those temporary enclosures were completed, exhibits most strikingly the laboriousness of the Roman legionaries. This, however, is foreign to our present subject. If the reader has any curiosity respecting these works, he will find some remarkable ones described in Cæsar’s Commentaries.[3] Just before war broke out between Athens and Sparta, the Thebans, always jealous of Athens, and more especially envious of its strict connection with Platæa, over which, as the head of the Bœotian confederacy, they claimed the same undefined but oppressive authority which was exercised by the Athenians and other leading cities over their allies, made an attempt to gain possession of Platæa, in concert with a party within its walls, consisting of citizens dissatisfied with the existing government. By the contrivance of the latter, a body of Theban troops was introduced by night, who without a struggle became, to all appearance, masters of the town, piled their arms in the market–place, and invited the inhabitants to place themselves under the protection of Thebes. But the Athenian party was greatly preponderant, and discovering the small number of their enemies they took courage and assaulted them. Almost all the Thebans were made prisoners, and subsequently put to death, in contravention of a promise of personal security implied, if not absolutely expressed in words. Immediate notice of what had occurred was sent to the Athenians, who, considering this as the commencement of war, removed the women and children, and all who were unfit for military duty, from Platæa, sending thither eighty of their own citizens to increase the garrison, and also probably to guard against any further attempts on the part of the disaffected.