[1] The Anabasis (which survives complete in seven books) is a history of the campaigns of Alexander the Great, specifically his conquest of the Persian Empire between 336 and 323 BC.
Arrian's chief sources in writing the Anabasis were the lost contemporary histories of the campaign by Ptolemy and Aristobulus and, for his later books, Nearchus.
The latter half of the book describes Alexander's pursuit of Darius through northern Iran, the revolt of the pretender Bessus, and the deaths of Philotas and Parmenion (331–329 BC).
Book 4 This book begins with describing the long Sogdian campaign of 329–327 BC against Bessus, Spitamenes, and Oxyartes, and the early stages of the campaigns in the Punjab (327–326 BC), with a notable departure from chronological sequence at 4.7–14, where Arrian collects many of the most notorious stories tending to Alexander's discredit in a single apologetic digression (the killing of Cleitus, the proskynesis affair, the pages' conspiracy and the death of Callisthenes).
[5] The original Greek text used by the Perseus Digital Library is the standard A.G. Roos Teubner edition published at Leipzig in 1907.
[8] Probably the most widely used scholarly English translation is Loeb Classical Library edition (with facing Greek text), in two volumes.
[11] A new translation by Martin Hammond with introduction and notes by John Atkinson appeared in the Oxford World's Classics series in 2013.