The analogy of a ship passing through a storm was used to illustrate the battle between the brothers and how it was resolved.
An analogy simply means comparing something to another thing in order for one to explain a particular situation. In this case, Creon used the analogy of a ship passing through a storm.
The ship represents Thebes. The storm in the analogy represented the battle between the brothers. The statement was simply used in making the readers understand that even though there's a storm, the ship eventually docked.
This implies that there was a resolution even in the midst of the challenges faced. Therefore, the analogy of a ship passing through a storm illustrated the battle between the brothers and how it was resolved.
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