Battle of Hysiae

The term Battle of Hysiae refers to two battles at the ancient location of Hysiae, located to the southwest of Argos and east of Tegea. The first battle took place in 669/8 BC, another in 417 BC. Both were battles between Sparta and Argos.
First battle
The first Battle of Hysiae is described by the ancient travel-writer Pausanias (2.24.7), who writes as follows:

Here are common graves of the Argives who conquered the Lacedaemonians in battle at Hysiae. This fight took place, I discovered, when Peisistratus was archon at Athens, in the fourth year of the twenty-seventh Olympiad, in which the Athenian, Eurybotus, won the foot-race. On coming down to a lower level you reach the ruins of Hysiae, which once was a city in Argolis, and here it is that they say the Lacedaemonians suffered their reverse.

The chronology of Pausanias would suggest that the battle was fought in 669/8 BC. All that is known is that...