Did the Kalash invent the Kalashnikov? A few of those might have persuaded the Macedonian army to take a different route.
The Macedonian army couldn’t have survived repeat large scale onslaughts if they had decided to invade India proper, instead of slowing the advance and turning around after the encounter with the army of what was essentially a border outpost chiefdom, under Porus (whose bravery inspired Alexander to declare him an ally).
After Aornos, Alexander crossed the Indus and fought and won an epic battle against King Porus, who ruled a region in the Punjab, in the Battle of the Hydaspes in 326 BC. Alexander was impressed by Porus’s bravery, and made him an ally. He appointed Porus as satrap, and added to Porus’ territory land that he did not previously own. Choosing a local helped him control these lands so distant from Greece. Alexander founded two cities on opposite sides of the Hydaspes river, naming one Bucephala, in honor of his horse, who died around this time. The other was Nicaea (Victory), thought to be located at the site of modern day Mong, Punjab.
East of Porus’ kingdom, near the Ganges River, were the Nanda Empire of Magadha and further east the Gangaridai Empire of Bengal. Fearing the prospect of facing other large armies and exhausted by years of campaigning, Alexander’s army mutinied at the Hyphasis River (Beas), refusing to march farther east. This river thus marks the easternmost extent of Alexander’s conquests.
As for the Macedonians, however, their struggle with Porus blunted their courage and stayed their further advance into India. For having had all they could do to repulse an enemy who mustered only twenty thousand infantry and two thousand horse, they violently opposed Alexander when he insisted on crossing the river Ganges also, the width of which, as they learned, was thirty-two furlongs, its depth a hundred fathoms, while its banks on the further side were covered with multitudes of men-at-arms and horsemen and elephants. For they were told that the kings of the Ganderites and Praesii were awaiting them with eighty thousand horsemen, two hundred thousand footmen, eight thousand chariots, and six thousand war elephants.
Alexander tried to persuade his soldiers to march farther, but his general Coenus pleaded with him to change his opinion and return; the men, he said, “longed to again see their parents, their wives and children, their homeland”. Alexander eventually agreed and turned south, marching along the Indus.
- Wiki (references at link).
http://en.m.wikipedia.org/wiki/Indian_campaign_of_Alexander_the_Great
Maybe, but the A-Man was pretty stubborn.