Diphridas was a Sparta

Sparta

Sparta or Lacedaemon, was a prominent city-state in ancient Greece, situated on the banks of the River Eurotas in Laconia, in south-eastern Peloponnese. It emerged as a political entity around the 10th century BC, when the invading Dorians subjugated the local, non-Dorian population. From c...

n general in the Corinthian War

Corinthian War

The Corinthian War was an ancient Greek conflict lasting from 395 BC until 387 BC, pitting Sparta against a coalition of four allied states; Thebes, Athens, Corinth, and Argos; which were initially backed by Persia. The immediate cause of the war was a local conflict in northwest Greece in which...

. In 391 BC

391 BC

Year 391 BC was a year of the pre-Julian Roman calendar. At the time, it was known as the Year of the Tribunate of Flavus, Medullinus, Camerinus, Fusus, Mamercinus and Mamercinus...

, he was placed in command of Spartan forces in Asia Minor, whose previous commander, Thibron, had been killed in an ambush. Diphridas continued his predecessor's policy of launching plundering raids into the territory of Persian satrap

Satrap

Satrap was the name given to the governors of the provinces of the ancient Median and Achaemenid Empires and in several of their successors, such as the Sassanid Empire and the Hellenistic empires....

 in the region, Struthas

Struthas

Struthas was a Persian satrap for a brief period during the Corinthian War. In 392 BC, he was dispatched by Artaxerxes II to take command of the satrapy of Sardis, replacing Tiribazus, and to pursue an anti-Spartan policy...

. These raids were highly successful; Diphridas at one point captured Struthas's son-in-law, and with the plunder he took he was able to hire mercenaries to enlarge his force.