Spartans have a weird reputation for being the undeniable kings of Classical warfare while in reality, they get a lot of really great press from the Battle of Thermopylae, but they weren't really better or worse than any of the other Greek city-states. In fact, for 17 years, the Army of Messenia, led by King Aristomenes, handed the Spartans their asses for 17 years until he was captured and executed by Spartans.
And he soon appeared again at the head of the Messenians, ready to kick more Spartan ass.
Can't stop, won't stop.
A lot of U.S. military veterans are gonna have a hard time hearing this, but there was very little that was special about Sparta. Contrary to popular belief, the upbringing of Spartan boys had nothing to do with military training and everything to do with being a good citizen and obeying the law. Between 550 BC and 371 BC, Sparta's win rate in pitched battles was 1-1, and the loss to Thebes in 371 really did them in. For good. Even at Thermopylae, yes 300 Spartans made a brave last stand, but Herodotus (and later, Frank Miller) forgot to mention the 700 Thespians who were also there, along with the 900 other lightly-armed infantry who couldn't afford the gear to be a hoplite.
The Spartans, while perhaps brave, weren't the bearded Hellenic crack team of ancient special operators they somehow get credit for being today. What they were was aggressive and present. The Messenians, sick of being slaves to stupid Spartans, rose up against their overlords and fought them at the Battle of Deres. Though no one really won that battle, one man stood out above the rest – Aristomenes. He fought so well the Messenians declared him their leader.
Aristomenes would be captured after a night of carnal delights with Spartan priestesses.
Aristomenes took the fight to Sparta and immediately took their temple to Athena. The Spartans returned and fought him again, only to lose once again. Aristomenes and the Messenians routed the Spartans over and over at Boar's Grave and Great Trench. After these victories, it was said that Aristomenes was captured and taken to Sparta, where he was sentenced to die a warrior's death. The Spartans led him to a cliff where he would be thrown off. But the sentence of a warrior's death meant Aristomenes would be tossed over while still wearing his armor. He was tossed over, and the Spartans went home, certain that a Messenian army without Aristomenes was no match for them.
The Messenian King, however, was still very much alive. Using his shield, which the Spartans gave him to die with, he slowed his fall against the side of the cliff. The descent itself wasn't even that far, considering he landed on the bodies of hundreds of his former fellow Messenian warriors who were sentenced to a similar fate. Using the bones of his comrades, Aristomenes climbed back up the cliff and walked back to his forces.
Some sources say a fox led Aristomenes away from the cliff. Either way, he survived.
As the two forces met up the next day, the legend goes, Aristomenes strode to the front of his forces. The Spartan Army was so surprised at seeing the reanimated corpse of the king they killed the day before that they broke ranks and fled. The Messenians would next move on the fortress at Mount Eira, one they would hold for some 11 years, from which they would conduct guerrilla raids.
Of course, time was not on the side of the Messenians holed up in the fortress. The siege ended Aristomenes when he led a column of women, children, and refugees out of the fortification and to safety on the island of Arkadia while 500 of the remaining defenders launched a diversionary attack on the Spartans. The refugees escaped and the defenders were killed to a man. Aristomenes left the Army for Rhodes, where he later died.
But this time, he stayed dead.