'View on the Indus', 1890. The Achaemenid conquest of the Indus Valley refers to military occupation of territories in North-western regions of India, from 6th-4th centuries BC. The Indian campaigns of Alexander the Great, began in 326 BC. From "Cassell's Illustrated Universal History, Vol. I - Early and Greek History", by Edmund Ollier. [Cassell and Company, Limited, London, Paris and Melbourne, 1890]