Photograph by Sharon Suchma, courtesy of the American Numismatic Society

The ancient Greek silver decadrachm shown here was minted in 323 B.C. (possibly in Babylon) and depicts a mounted Alexander charging an Indian war elephant (compare with photo of medieval miniature). During the Battle of the Hydaspes River, many of the wildly trumpeting elephants panicked, trampling Porus’s foot soldiers, while Macedonian archers picked off his cavalrymen. The Indian rajah’s defeat was devastating; his casualties have been variously estimated at 12,000 to 23,000 men. Yet Alexander saluted his foe’s bravery by magnanimously permitting Porus to continue to rule—under Greek control, of course.