This article describes a concept which is mentioned in J.R.R. Tolkien's works, but was never given a definite name.
The Angmar War was a centuries-long struggle between the Northern Dúnedain kingdom and the forces of Angmar, led by the Witch-king. Arnor was destroyed as a kingdom, though the Dúnedain of Arnor continued through the Chieftains. Angmar was soon itself obliterated by an Elf-Man alliance of Círdan and the southern kingdom of Gondor during the Battle of Fornost.