 While no major conflict occurred, there exist a form of cold war between Greece and Persia punctuated by incidents such as diplomatic moves and countermoves, threats, and raids, particularly along the border that separated the territories of the two powers.At its peak, membership swelled to about 200 and, in exchange for Athenian protection, each paid phoros in talents of silver while the more powerful members such as Samos, Chios, and Lesbos supplied warships as their tribute.The list of annual tributes were preserved as inscriptions in the marbles of the Athenian Acropolis.