This article describes a concept which is mentioned in J.R.R. Tolkien's works, but was never given a definite name.
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|Previous war: War of the Last Alliance|
|Next war: War of the Ring|
|Beginning: 1409 TA||End: 1944 TA (fighting finally ended in 1977)|
|Place: Arnor, Angmar, The Shire, Rivendell, Northwest Wilderland|
|Outcome: destruction of the kingdoms of Arnor and Angmar, decline of the Dúnedain of the North, the Eótheód take the upper Vales of the Anduin as their own from the remnants of Angmar.|
|Major battles: Arnorian Civil War, First Invasion of Angmar, Fall of Cardolan, Fall of Amon Sûl, Weather Hills skirmishes, Second Siege of Imladris, Fall of Fornost, Battle of Fornost, Eótheód Incursion.|
|Arnor, Lindon, Rivendell, Gondor, Shire, Khazad-dûm, the Eótheód.||Angmar, Gundabad, Misty Mountains, Rhudaur, Ettenmoors.|
|King Argeleb I||The Witch-king of Angmar, Hill-men lords, orc chieftains.|
A direct assault on Cardolan would probably result in disaster as Arthedain would have probably issued from the Weather Hills and struck Angmar's army in the rear or flank.
Therefore, Angmar was forced to launch an all out assault against the remnants of Arnor, using several forces, one to besiege Rivendell to prevent it from sending aid to Arnor, and through blocking Rivendell, also blocking reinforcements from Lórien. An army to tie up Arthedain along the Weather Hills and Amon Sul, and a final army to destroy Cardolan.
Angmar's attack was highly successful. Rivendell was successfully besieged, and Arthedain was hard pressed along the length of the hills. Not only that, but Amon Sûl was taken and sacked despite the heavy resistance. With Arthedain's forces pinned down or routing towards Fornost, Angmar's last army moved into Cardolan, which was a wide and open land, with little to no natural barriers.
It is probable that the Prince of Cardolan gathered what men he could quickly, rather than mustering his entire army, so Angmar's advance could be stopped and Cardolan's agricultural needs would not be laid waste. The Prince attacked, failed and was killed in the process. However, he did enough damage to Angmar so that it lacked the strength to capture Tyrn Gorthad, Cardolan's capital in the Barrow Downs.
Overall, the Campaign was a huge success for Angmar. No longer was Arnor an unbreakable wall of defenses. Although the Second Siege of Imladris was broken and Arthedain routed Angmar with the help of Lindon, Angmar had destroyed Amon Sül, Arthedain's chief defence in the Weather Hills, and Cardolan was on the verge of destruction and highly vulnerable.
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.