When Epicydes and Hippocrates had occupied Syracuse, and had alienated the rest of the citizens with themselves from the friendship of Rome, the Romans who had already been informed of the murder of Hieronymus, tyrant of Syracuse, appointed Appius Claudius as Pro-praetor to command a land force, while Marcus Claudius Marcellus[90] commanded the fleet. These officers took up a position not far from Syracuse, and determined to assault the town from the land at Hexapylus, and by sea at what was called Stoa Scytice in Achradina, where the wall has its foundation close down to the sea. Having prepared their wicker pent-houses, and darts, and other siege material, they felt confident that, with so many hands employed, they would in five days get their works in such an advanced state as to give them the advantage over the enemy. But in this they did not take into account the abilities of Archimedes;[91] nor calculate on the truth that, in certain circumstances, the genius of one man is more effective that any numbers whatever. However they now learned it by experience. The city was strong from the fact of its encircling wall lying along a chain of hills with overhanging brows, the ascent of which was no easy task, even with no one to hinder it, except at certain definite points. Taking advantage of this, Archimedes had constructed such defenses both in the town, and at the places where an attack might be made by sea, that the garrison would have everything at hand which they might require at any moment, and be ready to meet without delay whatever the enemy might attempt against them. The attack was begun by Appius bringing his pent-houses, and scaling ladders, and attempting to fix the latter against that part of the wall which abuts on Hexapylus toward the east. At the same time Marcus Claudius Marcellus with sixty quinqueremes was making a descent upon Achradina. Each of these vessels were full of men armed with bows and slings and javelins, with which to dislodge those who fought on the battlements. As well as these vessels he had eight quinqueremes in pairs. Each pair had had their oars removed, one on the larboard and the other on the starboard side, and then had been lasht together on the sides thus left bare. On these double vessels, rowed by the outer oars of each of the pair, they brought up under the walls some engines called "Sambucae," the construction of which was as follows: A ladder was made four feet broad, and of a height to reach the top of the wall from the place where its foot had to rest; each side of the ladder was protected by a railing, and a covering or pent-house was added overhead. It was then placed so that its foot rested across the sides of the lasht-together vessels, which touched each other with its other extremity protruding a considerable way beyond the prows.