Wild as a storm cloud moving off Olympus into heaven
out of a clear blue sky when Zeus brings cyclones on –
so wild the rout, the cries that came from the ships
as back through the trench they ran, formations wrecked.
– Homer
The Iliad, Book 16, lines 429-432. The Trojans run from the charging Achaeans. The image of a storm cloud sent from Olympus by Zeus into a clear blue sky makes up the epic simile describing this rout.