Fall of Fornost
Leading Up to the Siege
By the year 1974 TA things were looking very grim for the people Arnor. The Great Plague three hundred years previously had killed most of the people of Cardolan which later fell to the Witch King. And even with the aid of Elves and Hobbits most of the now diminished and totally demoralized people of Arnor were now waiting to make their final stand at Fornost, capitol city of Arthedain.
For the forces of Eriador exact numbers are not known, but it can be estimated that at the most ten thousand Men of Arnor were present at the city. Along with likely several thousand Elves of Lindon, Rivendell, Lórien, and five hundred Hobbits archers from the Shire.
Not much detail is known about what happened, but do we know that the the forces of Angmar were the decisive victors and most of the forces of Eriador were driven west toward the River Lune. While King Arvedui and some of his guard held out north of Fornost among the North Downs until it was untenable and fled northwest.
With Arthedain in his hands, the Witch King had conquered all of Arnor. Thereby taking the thrown in the king's palace, until a year later in 1975 TA when the forces of Eriador had regrouped with newly arrived reinforcements from Gondor. Which in the Battle of Fornost his army was destroyed, and he himself fled east over the Misty Mountains. Fornost was not resettled after the war. Not until several thousand years later after the War of the Ring under King Elessar.