The maritime expansion of Corinth at this time is proved by the foundation of colonies at Syracuse and Corcyra, and the equipment of a fleet of triremes (the newly invented Greek men-of-war) to quell a revolt of the latter city.
By dexterous management and large promises he overcame the scruples of the Greek troops against the length and danger of the war; a Spartan fleet of thirty-five triremes sent to Cilicia opened the passes of the Amanus into Syria and conveyed to him a Spartan detachment of 700 men under Cheirisophus.
Besides the triremes, or vessels with three banks of oars, we hear of quadriremes and quinqueremes with four and five banks of oars - larger and taller and more massive ships than had yet been used in Greek sea warfare.
No doubt, however, he went on writing and rewriting well into the last period of his life; for example, the recently discovered 'Ath i valwv 7roXtreia mentions on the one hand (c. 54) the archonship of Cephisophon (329-328), on the other hand (c. 46) triremes and quadriremes but without quinqueremes, which first appeared at Athens in 325-324; and as it mentions nothing later it probably received its final touches between 329 and 324.
The former treatise (chap. 9), under the head of examples (7rapabeiyµara), gives historical examples of the unexpected in war for the years 4 0 3, 371, 35 8, concluding with the year 340, in which the Corinthians, coming with nine triremes to the assistance of the Syracusans, defeated the Carthaginians who were blockading Syracuse with 150 ships.