Why is the Chorus, in Agamemnon, skeptical about the joy over the fire signal's message?
The Chorus of Argive Elders, from Agamemnon, are slow to believe that the ten year war in Troy is finally over. They, themselves, do not witness the fire which signals the victory of Menelaus and Agamemnon over the Trojans. Only the Watchman witnesses the signal fire.
The Chorus begins to talk about the war with Troy (disclosing the reason why the war even begun (Helen was taken)). The queen, Clytaemestra, has ordered sacrifices, and the Chorus questions her actions (they do not know that the war has ended). Once Clytaemestra tells the Chorus that the war is over, the Chorus repeatedly asks if news of the war was in a dream, a vision, or an "unfledged rumour."