In 431 BC, while peace already was precarious, Archidamus II, Sparta's king, sent a new delegation to Athens, demanding that the Athenians submit to Sparta's demands. This deputation was not allowed to enter Athens, as Pericles had already passed a resolution according to which no Spartan deputation would be welcomed if the Spartans had previously initiated any hostile military actions. The Spartan army was at this time gathered at Corinth, and, citing this as a hostile action, the Athenians refused to admit their emissaries. With his last attempt at negotiation thus declined, Archidamus invaded Attica, but found no Athenians there; Pericles, aware that Sparta's strategy would be to invade and ravage Athenian territory, had previously arranged to evacuate the entire population of the region to within the walls of Athens.