garrison on the Sicilian Straits would have been a dangerous menace to the peace of Italy." So they protected the peace of Italy from this "menace" by a war that lasted nearly a quarter of a century. They wrecked their own slowly acquired political moral in the process.
The Romans captured Messina, and Hiero deserted from the Carthaginians to the Romans. Then for some time the struggle centred upon the town Agrigentum. This the Romans besieged, and a period of trench warfare ensued. Both sides suffered greatly from plague and irregular supplies; the Romans lost 30,000 men; but in the end (261 B.C.) the Carthaginians evacuated the place and retired to their fortified towns on the western coast of the island of which Lilybæum was the chief. These they could supply easily from the African mainland, and, as long as their sea ascendancy held, they could exhaust any Roman effort against them.
And now a new and very extraordinary phase of the war began. The Romans came out upon the sea, and to the astonishment of the Carthaginians and themselves defeated the Carthaginian fleet. Since the days of Salamis there had been a considerable development of naval architecture. Then the ruling type of battleship was a trireme, a galley with three banks (rows) of oars; now the leading Carthaginian battleship was a quinquereme, a much bigger galley with five banks of oars, which could ram or shear the oars of any feebler vessel. The Romans had come into the war with no such shipping. Now they set to work to build quinqueremes, being helped, it is said, in their designing by one of these Carthaginian vessels coming ashore. In two months they built a hundred quinqueremes and thirty triremes. But they had no skilled navigators, no experienced oarsmen, and these deficiencies they remedied partly with the assistance of their Greek allies and partly by the invention of new tactics. Instead of relying upon ramming or breaking the oars of the adversary, which demanded more seamanship than they possessed, they decided to board the enemy, and they constructed a sort of long drawbridge on their ships, held up to a mast by a pulley and with grappling-hooks and spikes at the end. They also loaded their galleys with soldiers. Then as the Carthaginian rammed or swept alongside, this corvus,
