Final answer:
The plague that strikes the Greek forces in Homer's Iliad is lifted by Achilles, who in a meeting, encourages the truth to be revealed and actions to be taken to appease the god Apollo. Odysseus plays a role by returning Agamemnon's war prize to end the god's wrath.
Step-by-step explanation:
In the epic narrative of the Iliad by Homer, a deadly plague strikes the Greek forces (Argives) at Troy. This plague is brought upon them because Agamemnon, the Greek king, disrespects Apollo's priest, Chryses. In poetic mythology, Apollo, the god associated with disease and healing, is asked by Chryses to avenge the slight, and he sends a plague upon the Greek camp.
The one who ultimately solves the crisis and lifts the plague from the Argives is Achilles. In the narrative, Achilles, the greatest of the Greek warriors, calls for a meeting to solve the problem. He encourages the seer Calchas to reveal the cause of Apollo's wrath.
It is then suggested that the only way to appease Apollo and end the plague is for Agamemnon to return Chryses' daughter, whom he had taken as a war prize. Agamemnon eventually agrees, and Achilles sends Odysseus on the mission to return the girl and make the proper sacrifices to Apollo. Once this is done, the plague on the Argive forces is lifted.