The Battle of the Hydaspes was fought between Alexander the Great and Porus in May of 326 BC. It took place on the banks of the Hydaspes River in Punjab, as part of Alexander's Indian campaign. In what was possibly their most costly engagement, the Macedonian army secured a decisive victory over the Pauravas and captured Porus. Large areas of Punjab were subsequently absorbed into the Macedonian Empire; Porus was reinstated as the region's ruler after Alexander, having developed a newfound respect for the fierce resistance put up by Porus and his army, appointed him as a satrap. In spite of close Indian surveillance, Alexander's decision to cross the monsoon-swollen Hydaspes in order to catch Porus's army in the flank has been referred to as one of his "masterpieces" in combat. The Macedonians' engagement with the Indians at Hydaspes remains a very significant historical event with regard to the Wars of Alexander the Great, as it resulted in the exposure of Greek political and cultural influences to the Indian subcontinent, thereby yielding works such as Greco-Buddhist art, which would continue to impact Greeks and Indians for centuries to come. Location The battle took place on the east bank of the Hydaspes River (now called the Jhelum River, a tributary of the Indus River) in what is now the Punjab Province of Pakistan. Alexander later founded the city of Nicaea on the site; this city has yet to be discovered. Any attempt to find the ancient battle site is complicated by considerable changes to the landscape over time. For the moment, the most plausible location is just south of the city of Jhelum, where the ancient main road crossed the river and where a Buddhist source mentions a city that may be Nicaea. The identification of the battle site near modern Jalalpur/Haranpur is certainly erroneous, as the river (in ancient times) meandered far from these cities. Background After Alexander defeated the last of the Achaemenid Empire's forces under Bessus and Spitamenes in 328 BC, he began a new campaign to further extend his empire towards India in 327 BC. After fortifying Bactria with 10,000 men, Alexander commenced his invasion of India through the Khyber Pass. Whilst possessing a much larger army, at the battle, an estimated 40,000 infantry and 5,000 cavalry crossed the river in time to engage the enemy. During this battle, Alexander suffered heavy losses compared to his earlier