Plutarch wrote: “Alexander, in his own letters, has given us an account of his war with Porus. Porus committed most army to the Alexander's charging force and left himself vulnerable to an attack from the concealed cavalry. Alexander then concealed part of his cavalry and released the remainder of his army in an attack. 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. Curtius wrote, “Porus himself rode an elephant which towered above the other beasts. 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. The Indians were defeated in a fierce battle, even though they fought with elephants, which the Macedonians had little experience fighting Alexander's army crossed the heavily defended river in dramatic fashion during a violent thunderstorm to meet Porus' forces. 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. Porus was one of the most powerful Indian leaders. The battle against Porus was the biggest event of Alexander's campaign in Pakistan and India.

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 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.

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