Pulakesin II of the Chalukya dynasty defeated Emperor Harshavardhana of Kannauj on the banks of the Narmada River, effectively halting Harsha's southward expansion. This significant victory is recorded in the Aihole inscription (dated Saka 556 = 634 AD), composed by Ravikirti. While the inscription is dated 634 AD, historical sources and interpretation of the inscription place the battle itself around 618 AD or 619 AD. Option B (618 AD) is the date most commonly cited for the battle.