he must even have been able to muster something of a fleet; for the island of Samos was soon joined to his possessions.[515] It is probable that the co-operation of the slave populations in these various cities added greatly to his success. His conquests may have been somewhat sporadic, and there is no reason to suppose that he commanded all the country included in the wide range of his captured cities and extending from Thyatira to the coast and from the Gulf of Hermus to that of Iassus. The forces which he could dispose of seem to have been sufficiently engaged in holding their southern conquests; there is no trace of his controlling the country north of Phocaea or of his even attempting an attack on Pergamon the capital of his kingdom. His army, however, must have been increasing in dimensions as well as in experience. Thracian mercenaries were added to his servile bands,[516] and the movement had assumed dimensions which convinced the Romans that this was not a tumult but a war. Their earlier efforts were apparently based on the belief that local forces would be sufficient to stem the rising. Even after the revolt of Aristonicus was known, they persisted in the idea that the commission, which would doubtless in any case have been sent out to inspect the new dependency, was an adequate means of meeting the emergency. This commission of five,[517] which included Scipio Nasica, journeyed to Asia only to find that they were attending on a civil war, not on a judicial dispute, and that the country which was to be organised required to be conquered. The client kings of Bithynia, Paphlagonia, Cappadocia and Pontus, all eager for praise or for reward, had rallied loyally to the cause of Rome;[518] but the auxiliary forces that they brought were quite unable to pacify a country now in the throes of a servile war, and they lacked a commander-in-chief who would direct a series of ordered operations. Orders were given for the raising of a regular army, and in accordance with the traditions of the State this force would be commanded by a consul.