King Porus of Punjab A great battle took place in 326 BC at the banks of river Jhelum in West Punjab between Alexander , the greek-macedonian king and Porus , the king of Punjab. This battle halted the eastward advance of the Greek-Macedinian army and eventually led to the downfall of the Alexander's empire. So devastating was the psychological impact of this battle that the greek soldiers refused to fight and demanded to go back home. Alexander had ambitious goal of conquering India, but the battle against Porus curbed his aspirations and he retured back to Persia a dejected man. Alexander's Invasion of India Alexander crossed Hindukush mountains via the Khyber Pass in 327 BC after defeating the Indo-Persian satrapy of Gandhara . Next was the great kingdom of Taxila . Its King Ambhi submitted without offering any resistance to Alexander. Next target for Alexander was King Abhisares , the king of Abhira including the region of Jammu and Kashmir. Abhisares also sent his ambass