The Athenian relationship with Sparta was ruined when the Spartans asked Athens not to re-build its walls and they were ignored. Sparta reasoned that Athens would be less willing to fight if it felt protected. Then, the Spartan earthquake of 464 B.C. led to the Messenian revolt which threatened the entire Spartan culture. Athens sent an army under Cimon, but the Spartans became suspicious of Athenian motives and sent the hoplites home. Next, Athens attempted to expand its empire by land, but failed when the territory became greater than the Athenian army could manage. When Athens was defeated in a land battle with Boetia in 447 B.C, it gave up imperialism by land and signed a thirty year treaty with Sparta.
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