Explanation:

The date of Pulakeshi’s great triumph over Harsha in a battle fought primarily with elephants, on the banks of the Narmada, can now be fixed at 618 AD (as per new evidence from the copper plate shown above found in 2016)
Pulakeshin, who ruled from the Chalukyan capital of Badami, challenged Harsha’s conquests. The former had established himself as ‘lord paramount’ of the south, as Harsha had of the north. Unwilling to tolerate the existence of a powerful rival in the south, Harsha had marched from Kanauj with a huge force. Such was Pulakeshin’s efficiency in guarding the passes of the Narmada that Harsha was compelled to accept the river as the demarcation and retire from the battlefield after losing most of his elephant force.
“It was believed that the battle occurred sometime between 612 AD and 634 AD. But now, thanks to this new copper plate, it can be ascertained definitively to have taken place in the winter of 618-619 AD.