History of the Peloponnesian War

At this same time the Chians and Pedaritus sent messengers to Astyochus, notwithstanding his holding back, and begged him to succour them in their siege with all his fleet, and not to permit the largest of the allied cities in Ionia to be both excluded from the use of the sea, and wasted by forays on the land.

For the slaves of the Chians being numerous, and indeed forming the largest body there was in any one city, except that of the Lacedaemonians, and at the same time being, in consequence of their great numbers, punished more severely than usual in cases of offence, when the Athenian army appeared to be firmly established, with the advantage of a fortified position, the greater part deserted to them; and these did the most mischief to the country, through their acquaintance with it.

The Chians therefore represented, that while there was still a hope and possibility of stopping them, while Delphinium was still being fortified, and not yet completed, and a higher wall was being erected round their camp and the ships, it was incumbent on him to assist them. And although Astyochus, because of his threat on the occasion already mentioned, had not intended to do it, when he saw that the allies also were anxious for their relief, he set out to succour them.