The Odyssey: Poseidon v. Athena?

Well, Poseidon wishes to thwart Odysseus' journey home, after Odysseus had blinded his son Polyphemus. On the other hand, Athena favors the hero because of his craftiness and shrewdness, and tries to ist him in reaching home. That should be a good start for you. Oh, and you may also want to read up on the contest between Poseidon and Athena over whom would be named the patron deity of the capital of Greece.