The Persian invasion.
Sparta helped Athens expel its tyrant Hippias, providing a force to besiege him and force his exit into exile in Persia.
Yes
The Peloponnesian war
There was not rivalry. Sparta, although militarily powerful, was usually reluctant to go to war. Athens, overconfident with the power it gained from its empire, was aggressive and interfered in the affairs of other cities. Sparta appealed to Sparta to back off when it tried to bankrupt Megara, a member of the Peloponnesian League, A rampant Athens persisted and war ensued.
The Peloponnesian War .
The conflict between Athens and Sparta , known as the Peloponnesian War , was won by the city-state of Sparta .
No, its opponent Athens did, brought on be its people being cooped up in Athens under siege by the Peloponnesian League led by Sparta.
. . . the Peloponnesian War .
Athens was enemies with Sparta and Sparta was enemies with Athens
The Persian invasion.
The Persian Wars
to answer this question i would need a brain and i dont have one