Battle of Cunaxa 410 B.C.
The Achaemenid King, Darius II died in 404 B.C. and was succeeded by his eldest son, Artaxerxes II. The death of Darius had precipitated a power struggle between Artaxerxes II and his brother, 'Cyrus, the younger', the satrap of Anatolia, which culminated in the battle of Cunaxa 401 B.C. near Babylon. A description of the battle is preserved in detail by Xenophon in his classic Anabasis as well as in Plutarch - Artaxerxes II.