Cirith Thoronath

Cirith Thoronath was a location through which refugees from the Fall of Gondolin made their escape after passing through Idril's Secret Way. It was here that they were set upon by a Balrog, who was challenged by Glorfindel, leading to a fierce battle between the two. After ruining its helmet and piercing its belly, Glorfindel was dragged by the demon over a nearby cliff, with both falling to their deaths.