History of the Peloponnesian War

During the same winter Hippocrates the Lacedaemonian sailed from the Peloponnesus with ten Thurian ships, under the command of Dorieus son of Diagoras and two colleagues, and one Laconian and one Syracusan ship, and put in at Cnidos, which had at length revolted at the instigation of Tissaphernes.

And when those in authority at Miletus heard of their coming, they gave orders that one half of the newly arrived ships should guard Cnidos and that the other half should cruise around Triopium and seize the merchantmen that touched there on the way from Egypt. Now this Triopium is a headland projecting from the territory of Cnidos and sacred to Apollo.