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Forays into the Indian subcontinent

After the death of Spitamenes and his marriage to Roxana (Raoxshna in Old Iranian) to cement relations with his new satrapies, Alexander turned to the Indian subcontinent. He invited the chieftains of the former satrapy of Gandhara (a region presently straddling eastern Afghanistan and northern Pakistan), to come to him and submit to his authority. Omphis (Indian name Ambhi), the ruler of Taxila, whose kingdom extended from the Indus to the Hydaspes (Jhelum), complied, but the chieftains of some hill clans, including the Aspasioi and Assakenoi sections of the Kambojas (known in Indian texts also as Ashvayanas and Ashvakayanas), refused to submit. Ambhi hastened to relieve Alexander of his apprehension and met him with valuable presents, placing himself and all his forces at his disposal. Alexander not only returned Ambhi his title and the gifts but he also presented him with a wardrobe of "Persian robes, gold and silver ornaments, 30 horses and 1,000 talents in gold". Alexander was emboldened to divide his forces, and Ambhi assisted Hephaestion and Perdiccas in constructing a bridge over the Indus where it bends at Hund, supplied their troops with provisions, and he received Alexander and his whole army in his capital city of Taxila, with every demonstration of friendship and the most liberal hospitality.

On the subsequent advance of the Macedonian king, Taxiles accompanied him with a force of 5,000 men and took part in the Battle of the Hydaspes. After that victory, he was sent by Alexander in pursuit of Porus, to whom he was charged to offer favourable terms, but narrowly escaped losing his life at the hands of his old enemy. Subsequently, the two rivals were reconciled by the personal mediation of Alexander; Taxiles contributed zealously to the equipment of the fleet on the Hydaspes and was entrusted by Alexander with the government of the whole territory between that river and the Indus. A considerable accession of power was granted him after the death of Philip, son of Machatas, and he was allowed to retain his authority at the death of Alexander himself (323 BC), as well as in the subsequent partition of the provinces at Triparadisus, 321 BC.

In the winter of 327/326 BC, Alexander personally led a campaign against the Aspasioi of the Kunar Valley, the Guraeans of the Guraeus Valley, and the Assakenoi of the Swat and Buner Valleys. A fierce contest ensued with the Aspasioi in which Alexander was wounded in the shoulder by a dart, but eventually the Aspasioi lost. Alexander then faced the Assakenoi who fought against him from the strongholds of Massaga, Ora, and Aornos.

The fort of Massaga was reduced after days of bloody fighting in which Alexander was seriously wounded in the ankle. According to Curtius, "Not only did Alexander slaughter the entire population of Massaga, but also did he reduce its buildings to rubble." A similar slaughter followed at Ora. In the aftermath of Massaga and Ora, numerous Assakenians fled to the fortress of Aornos. Alexander followed close behind and captured the strategic hill-fort after four bloody days.

After Aornos, Alexander crossed the Indus and won an epic battle against King Porus, who ruled a region lying between the Hydaspes and the Acesines (Chenab), in what is now 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's territory land that he did not previously own, towards the south-east, up to the Hyphasis (Beas). Choosing a local helped him control these lands that were distant from Greece. Alexander founded two cities on opposite sides of the Hydaspes river, naming one Bucephala, in honour 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. Philostratus the Elder in the Life of Apollonius of Tyana writes that in the army of Porus, there was an elephant who fought bravely against Alexander's army, and Alexander dedicated it to the Helios (Sun) and named it Ajax because he thought that such a great animal deserved a great name. The elephant had gold rings around its tusks and an inscription was on them written in Greek: "Alexander the son of Zeus dedicates Ajax to the Helios" (ΑΛΕΞΑΝΔΡΟΣ Ο ΔΙΟΣ ΤΟΝ ΑΙΑΝΤΑ ΤΩΙ ΗΛΙΩΙ).