Definition of "ridge"

He thought it was no time to ſtay, / And let the Night too ſteal away, / But in a trice advanced the Knight, / Upon the Bare Ridge, Bolt upright, / And groping out for Ralpho’s Jade, / He found the Saddle too was ſtraid […]

1678, [Samuel Butler], “[The Third Part of Hudibras]”, in Hudibras. The Third and Last Part, London: […] Robert Horne, […], published 1679; republished in A[lfred] R[ayney] Waller, editor, Hudibras: Written in the Time of the Late Wars, Cambridge: University Press, 1905, canto I, pages 237–238

It was not far from the house; but the ground sank into a depression there, and the ridge of it behind shut out everything except just the roof of the tallest hayrick.

1879, R[ichard] J[efferies], chapter 1, in The Amateur Poacher, London: Smith, Elder, & Co., […]

Maccario, it was evident, did not care to take the risk of blundering upon a picket, and a man led them by twisting paths until at last the hacienda rose blackly before them. Appleby could see it dimly, a blur of shadowy buildings with the ridge of roof parapet alone cutting hard and sharp against the clearing sky.

1907, Harold Bindloss, chapter 26, in The Dust of Conflict

the British Guards lie down behind a ridge to avoid the shot and shell from the opposite heights

1853-1855, Joachim Hayward Stocqueler, The Life of Field-Marshal the Duke of Wellington

[…] Which to maintaine, I would allow him oddes, / And meete him, were I tide to runne afoote, / Euen to the frozen ridges of the Alpes, / Or any other ground inhabitable, / Where euer Engliſhman durſt ſet his foote.

1595 December 9 (first known performance), William Shakespeare, “The life and death of King Richard the Second”, in Mr. William Shakespeares Comedies, Histories, & Tragedies: Published According to the True Originall Copies (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, [Act I, scene i], lines 62–66