Plutarch wrote: “Alexander, in his own letters, has given us an account of his war with Porus. He says the two armies were separated by the river Hydaspes, on whose opposite bank Porus continually kept his elephants in order of battle, with their heads towards their enemies, to guard the passage; that he, on the other hand, made every day a great noise and clamor in his camp, to dissipate the apprehensions of the barbarians; that one stormy dark night he passed the river, at a distance from the place where the enemy lay, into a little island, with part of his foot, and the best of his horse. Here there fell a most violent storm of rain, accompanied with lightning and whirlwinds, and seeing some of his men burnt and dying with the lightning, he nevertheless quitted the island and made over to the other side. The Hydaspes, he says, now after the storm, was so swollen and grown so rapid, as to have made a breach in the bank, and a part of the river was now pouring in here, so that when he came across, it was with difficulty he got a footing on the land, which was slippery and unsteady, and exposed to the force of the currents on both sides.
The last great battle of Alexander’s campaign took place at Jhelum (Hydaspes) on the Jhelum (Hydaspes) River not far from the Indus River (110 kilometers southeast of present-day Islamabad, Pakistan) against King Porus, a massive leader who it is said to have stood nearly seven feet tall and presided over a kingdom that covered much of the Punjab in present-day India and Pakistan. The battle resulted in a complete Greek victory and the annexation of the Punjab, located beyond the far easternmost boundaries of the already absorbed Persian Empire, into Alexander’s Empire.
The battle against Porus was the biggest event of Alexander’s campaign in Pakistan and India. Porus was one of the most powerful Indian leaders. When Alexander reached the Jhelum River he may have hoped that Poros would submit him as other leaders had but instead found a large army eager for a fight. Alexander’s army crossed the heavily defended river in dramatic fashion during a violent thunderstorm to meet Porus’ forces. The Indians were defeated in a fierce battle, even though they fought with elephants, which the Macedonians had little experience fighting
In the spring of 326 B.C., Alexander’s army engaged King Porus’ force of 35,000 infantrymen, 10,000 cavalry and 200 battle-trained elephants. Curtius wrote, “Porus himself rode an elephant which towered above the other beasts. His armor, with its gold and silver inlay, lent distinction to his unusually large physique.“ The two forces were opposite each other on different sides of the river and Alexander lead his attack in the night during a thunderstorm so the Indian army wouldn’t hear or see him coming. Alexander then concealed part of his cavalry and released the remainder of his army in an attack. Porus committed most army to the Alexander’s charging force and left himself vulnerable to an attack from the concealed cavalry.
When Porus was taken prisoner, and Alexander asked him how he expected to be used, he answered, “As a king.“ For that expression, he said, when the same question was put to him a second time, comprehended every thing. And Alexander, accordingly, not only suffered him to govern his own kingdom as satrap under himself, but gave him also the additional territory of various independent tribes whom he subdued, a district which, it is said, contained fifteen several nations, and five thousand considerable towns, besides abundance of villages. To another government, three times as large as this, he appointed Philip, one of his friends.