Is the poem 'Le Cor' by Alfred de Vigny available in English translation?

Yes, the poem Le Cor ("The Horn") by Alfred de Vigny (March 27, 1797 - September 17, 1863) is available in English translation. Thomas F. Bertonneau, Professor at State University of New York in Oswego, makes a translation of the first of the poem's four parts available on-line in the article "Le Cor" and "La Mort du loup: The Scenic Imagination in Two Poems by Alfred de Vigny" originally published, with assistance from Susan D. Bertonneau, in Anthropoetics 16, no 2 (Spring 2011). He may have made a complete translation available elsewhere, in book, journal or manuscript form.