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The country was much intersected and poorly furnished with grain, the towns were situated for the most part on cliffs and tongues of land, and were accessible from the mainland only by           which it was difficult to cross ; the provi sion of supplies and the conducting of sieges were equally difficult for the army attacking by land, while the Celts by means of their vessels could furnish the towns easily with everything needful, and in the event of the worst could accomplish their evacuation.