Each had allies which augmented its power.Athens had an empire of about 180 city-states spread around theeastern Aegean Sea,. It had strong walls, which extended down tothe sea, which enabled it to be resupplied during a siege. It alsohad a superior navy, which gave it the ability to threaten and raidopposing cities of the Peloponnesian League led by Sparta, and toensure resupply of the city by sea from its empire.The Peloponnesian League had the strongest land forces, and wasable to besiege Athens. By whittling don Athens' allies, itprogressively reduced Athens' power and resupply, until finallyafter 27 years of fighting, the Athenian fleet was destroyed(Persia gave money to pay for a Peloponnesian fleet) and Athens wasstarved into submission.