Sicily, as will be seen by referring to the map, is of a triangular form. It was only the southern portion which was at this time in the hands of the Sicilians. There were two foreign and hostile powers in possession, respectively, of the northeastern and northwestern portions. In the northeastern corner of the island was the city of Messana--the Messina of modern days. In the time of Pyrrhus's expedition, Messana was the seat and stronghold of a warlike nation, called the Mamertines, who had come over from Italy across the Straits of Messana some years before, and, having made themselves masters of that portion of the island, had since held their ground there, notwithstanding all the efforts of the Sicilians to expel them. The Mamertines had originally come into Sicily, it was said, as Pyrrhus had gone into Italy--by invitation. Agathocles sent for them to come and aid him in some of his wars. After the object for which they had been sent for had been accomplished, Agathocles dismissed his auxiliaries, and they set out on their return. They proceeded through the northeastern part of the island to Messana, where they were to embark for Italy. Though they had rendered Agathocles very efficient aid in his campaigns, they had also occasioned him an infinite deal of trouble by their turbulent and ungovernable spirit; and now, as they were withdrawing from the island, the inhabitants of the country through which they passed on the way regarded them every where with terror and dread. The people of Messana, anxious to avoid a quarrel with them, and disposed to facilitate their peaceable departure from the land by every means in their power, received them into the city, and hospitably entertained them there. Instead, however, of quietly withdrawing from the city in proper time, as the Messanians had expected them to do, they rose suddenly and unexpectedly upon the people, at a concerted signal, took possession of the city, massacred without mercy all the men, seized the women and children, and then, each one establishing himself in the household that choice or chance assigned him, married the wife and adopted the children whose husband and father he had murdered. The result was the most complete and extraordinary overturning that the history of the world can afford. It was a political, a social, and a domestic revolution all in one. This event took place many years before the time of Pyrrhus's expedition; and though during the interval the Sicilians had made many efforts to dispossess the intruders and to recover possession of Messana, they had not been able to accomplish the work. The Mamertines maintained their ground in Messana, and from that city, as their fortress and stronghold, they extended their power over a considerable portion of the surrounding country.