 Diomedes and Odysseus were Agamemnon's most trusted officers.When the sacrifice of Iphigenia (Agamemnon's daughter) became a necessity for Achaeans to sail away from Aulis, king Agamemnon had to choose between sacrificing his daughter and resigning from his post of high commander among Achaeans (in which case Diomedes would probably become the leader).When he decided to sacrifice his daughter to Artemis, Diomedes and Odysseus were among the few Achaean officers familiar with his plans.