The world in 418 BC — what happened that year

14 events the sources record for this year, grouped by region.

What happened

Alcibiades came to Argos and held talks with the democratic faction. (Diodorus Siculus, Library of History 12.81.3)
Agis gathers the whole army and allies at Phlius and marches on Argos (Thucydides, History of the Peloponnesian War 5.57.2)
The Argives meet the Spartans at Methydrium, but Agis slips away by night (Thucydides, History of the Peloponnesian War 5.58.2)
Agis descends by a rough road into the plain of Argos and plunders Saminthus (Thucydides, History of the Peloponnesian War 5.58.5)
With the Argives surrounded, Agis accepts a four-month truce and withdraws, drawing his soldiers' condemnation (Thucydides, History of the Peloponnesian War 5.60.1)
The Athenian forces of Laches and Nicostratus join up and besiege Arcadian Orchomenus until it surrenders (Thucydides, History of the Peloponnesian War 5.61.1–5)
Sparta angrily condemns Agis and creates an unprecedented law attaching a board of ten advisers to him (Thucydides, History of the Peloponnesian War 5.63.4)
Fearing Tegea might defect, Sparta sends out its whole army and goes to Tegea by way of Oresteum (Thucydides, History of the Peloponnesian War 5.64.3)
Near the temple of Heracles, Agis plunders Mantinean territory and diverts the water to draw the enemy onto the plain (Thucydides, History of the Peloponnesian War 5.65.4–5)
The battle of Mantinea begins: the Argive side charges in haste, while the Spartans advance slowly to the sound of flutes (Thucydides, History of the Peloponnesian War 5.70.1)