<Tr> <Td_colspan="2"> <Ul> <Li> Cophen </Li> <Li> Aornos </Li> <Li> Hydaspes </Li> <Li> Mallian Campaign </Li> </Ul> </Td> </Tr> <Ul> <Li> Cophen </Li> <Li> Aornos </Li> <Li> Hydaspes </Li> <Li> Mallian Campaign </Li> </Ul> <P> The Battle of the Hydaspes was fought in 326 BC between Alexander the Great and King Porus of the Paurava kingdom on the banks of the river Jhelum (known to the Greeks as Hydaspes) in the Punjab region of the Indian subcontinent (modern - day Punjab, Pakistan). The battle resulted in a complete Greek victory and the annexation of the Punjab, which lay beyond the far easternmost confines of the already absorbed Persian Empire, into the Macedonian Empire . </P> <P> Alexander's decision to cross the monsoon - swollen river despite close Indian surveillance, in order to catch Porus' army in the flank, has been referred as one of his "masterpieces". Although victorious, it was also the most costly battle fought by the Macedonians . The resistance put up by King Porus and his men won the respect of Alexander, who asked Porus to become one of his satraps . </P>

Which ruler fought the famous battle on the banks of jhelum river