No apology should be needed for treating afresh these much-discussed battles, if only because the last two years have produced new and important evidence from Delos; though in fact the literary allusions, scanty as they are, have hardly even yet been sufficiently elucidated. I hope in this paper to fix the dates of Andros and Cos by the Delian archon-list, and to consider what that means in terms of B.C. In a subsequent paper, to be published in the next number of this Journal, I hope, by working out the history of the ship which Antigonus Gonatas dedicated to Apollo, to confirm the date assigned to Cos in this paper. If these two dates could really be fixed, they would be invaluable for our understanding of Aegean history in the middle of the third century.