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In 431 BCE, Hyrkanos was hired by Athens to aid their forces in Megaris against the encroaching Spartan forces. He made several attempts to sabotage the Spartan war efforts. To this end, he hired an Athenian soldier and gave him a Spartan soldier outfit in order to infiltrate the Spartan camp in Pagai and steal a tablet containing an account of their activities in the region.
At one point, Hyrkanos also attacked and slew a Spartan supply convoy on its way through the Occupied Forest of Tripodiskos. The supplies he left alone, letting the citizens of Megara, among them Neaera, take them.  The Spartans sent Dolios to investigate, and he enlisted the help of the misthios Kassandra to hunt down and eliminate Hyrkanos, and she did.