Battle of the Peak

" ...Those that looked up from afar thought that the mountain was crowned with storm. Thunder they heard, and lightning, they said, smote upon Celebdil, and leaped back broken into tongues of fire."

― The Two Towers, The White Rider

Gandalf's name for his climactic battle with the Balrog known as Durin's Bane, on the peak of the mountain called Celebdil, the Silvertine.