Calchas gives Agamemnon and Menelaus the details of the sacrifice needed to appease the Gods.
Subtitles in this scene read:
To Artemis, the Goddess... ...whose sacred wood in Aulis... ...was soiled with animal blood... ...the King of Argos, Agam...
You Menelaus. Read on.
...Agamemnon must sacr... ...must sacrifice... ...his first-born daugher... Iphigenia