“When the Romans, according to their design, had gained the foot of the walls, and thought themselves well covered, they found themselves exposed either to an infinity of darts, or overwhelmed with stones, which fell directly upon their heads; there being no part of the wall which did not continually pour that mortal hail upon them. This obliged them to retire. But they were no sooner removed than a new discharge of darts overtook them in their retreat; so that they lost great numbers of men, and almost all their galleys were disabled or beat to pieces, without being able to revenge their loss in the least upon their enemies: for Archimedes had planted most of his machines in security behind the walls; and the Romans, says Plutarch, repulsed by an infinity of wounds, without seeing the place or hand from which they came, seemed to fight in reality with the gods. “Marcellus, though at a loss what to do, and not knowing how to oppose the machines of Archimedes, could not, however, forbear pleasantries upon them. ‘Shall we persist,’ said he to his workmen and engineers, ‘in making war with this Briareus of a geometrician, who treats my galleys and sambucæ so rudely? He infinitely exceeds the fabled giants with their hundred hands, in his perpetual and surprising discharges upon us.’ Marcellus had reason for referring to Archimedes only; for the Syracusans were really no more than the members of the engines and machines of that great geometrician, who was himself the soul of all their powers and operations. All other arms were unemployed; for the city at that time made use of none, either defensive or offensive, but those of Archimedes. “Marcellus at length renounced his hopes of being able to make a breach in the place, gave over his attacks, and turned the siege into a blockade. The Romans conceived they had no other resource than to reduce the great number of people in the city by famine, in cutting off all provisions that might be brought to them either by sea or land. During the eight months in which they besieged the city, there were no kind of stratagems which they did not invent, nor any actions of valour left untried, almost to the assault, which they never dared to attempt more. So much force, on some occasions, have a single man, and a single science, when rightly applied. “A burning glass is spoken of, by means of which Archimedes is said to have burned part of the Roman fleet.