A medieval re-enactment became all too real for a young woman who was struck in the head with a sword in Melbourne’s north.

Advanced life support paramedics rushed to Princes Park in Carlton just before 10pm on Tuesday after the 18-year-old was hit on the head with the imitation weapon - fortunately, made only of rubber - during a mock battle.

Players face off in a Swordcraft mock battle in Princes Park on Tuesday. Credit:Michael Waghorn

The woman had bruising and swelling around her right temple and was fitted with a neck brace.

She was taken to the Royal Melbourne Hospital in a stable condition.