What evidence exists to indicate that unity was achieved during the war against Persia between Athens and Sparta?
The Athenians accepted Spartan leadership, even after Athens was
destroyed. Their armies fought effectively together against Xerxes
eventually driving the Persians out of Greece.
The Spartans were prepared to fight Persia in the Greek mainland
despite knowing it would be easier to simply defend the Isthmus of
Corinth.