In The Odyssey, how does Odysseus apply what he learns from Agamemnon in the underworld to his own situation in Ithaca?
It is in Book Eleven of this epic classic that Odysseus makes his voyage down into the underworld and meets with various characters. Agamemnon tells his former comrade how he met his end at the hands of his wife, Clytemnestra, and he expresses envy at Penelope's faithfulness compared to the treachery of his own deceitful wife.
We can perhaps see in this comparison that Agamemnon draws between his wife and Penelope the seeds of doubt that cause Odysseus to spend so long trying to ascertain Penelope's faithfulness when he reaches Ithaca. He could have overthrown the suitors much more quickly, but having been given this information, he becomes suspicious of his wife, not wishing to share the same fate as Agamemnon.