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In page Poseidon:

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They agreed that each would give the Athenians one gift and the Athenians would choose whichever gift they preferred. Poseidon struck the ground with his trident and a spring sprang up; the water was salty and not very useful, but represented his true gift - the access to trade. Athens at its height was a significant sea power, defeating the Persian fleet at the Battle of Salamis.[citation needed]