Quintus Curtius Rufus, History of Alexander 8.14.11

8.14.11

Herculis simulacrum agmini peditum praeferebatur: id maximum erat bellantibus incitamentum, et deseruisse gestantis militare flagitium habebatur.

A few which were driven off the field by the darts of the enemy made their way to Porus, who was making most energetic preparations for the contest. As soon as he saw his chariots scattered amid his ranks, and wandering about without their drivers, he distributed his elephants to his friends who were nearest him. Behind them he had posted the infantry and the archers and the men who beat the drums, the instruments which the Indians use instead of trumpets to produce their war music. The rattle of these instruments does not in the least alarm the elephants, their ears, through long familiarity, being deadened to the sound. An image of Hercules was borne in front of the line of infantry, and this acted as the strongest of all incentives to make the soldiers fight well. To desert the bearers of this image was reckoned a disgraceful military offence, and they had even ordained death as a penalty for those who failed to bring it back from the battlefield, for the dread which the Indians had conceived for the god when he was their enemy had been toned down to a feeling of religious awe and veneration.