Why was Alexander the Great unsuccessful in his attempt to conquer India?

Answer 1

Alexander's army was reduced after all the series of battles through Persia.
Alexander's army was mixed with the other infantry and cavalry of the kingdoms he defeated. The army lacked a proper order, it was not like the complete Greek army though led by the great Greek ruler Alexander III.
So the army was crushed beneath the Indian elephants feet which the army of Alexander came across in huge herds.
They had fought with elephants in Persia too but not with huge number of herds they came across in India and the army was in proper order at battle of Persia.

Answer 2

BECAUSE

By the time Alexander reached the borders of India , he had a substantial number of elephants under his own command(captured from persians). When it came to defeating Porus, who ruled in the Punjab , Alexander found himself facing a considerable force of between 85 and 100 war elephants at the Battle of the Hydaspes River. Preferring stealth and mobility to sheer force, Alexander manoeuvered and engaged with just his infantry and cavalry, ultimately defeating Porus' forces, including his elephant corps, albeit at some cost. Looking further east again, however, Alexander could see that the kings of the Nanda Empire and Gangaridai could deploy as between 3,000 and 6,000 war elephants. Such a force was many times larger than the number employed by the Persians and Greeks, which discouraged Alexander's small band of men and effectively halted their advance into India

India not only rich but also very strong

Answer 3

His army had had enough of fighting after ten years, wanted to go home and refused to go further. He appealed to them but they refused, so he had to turn back.

He vented his spite on them by taking them back to Babylon through the desert along the coast, where a great many of them died through starvation and being attacked by the local tribes along the way.

Answer 4

Years of campaigning left his forces exhausted and the prospect of facing other large armies was just too much for them. Alexander's army finally mutinied at the Hyphasis River and refused to march farther east.

Answer 5

His army had had enough of fighting after ten years, wanted to go home and refused to go further. He appealed to them but they refused, so he had to turn back.

Answer 6

His army, ten years on campaign, wanted to enjoy the spoils and demanded to return home.