Angmar assaults RivendellAngmar assaults Rivendell - After the establishment of Angmar, it quickly became expansionistic.  Both the kingdoms of Elves and Men were targeted.

 

"Arveleg son of Argeleb, with the help of Cardolan and Lindon, drove back his enemies from the Hills; and for many years Arthedain and Cardolan held in force a frontier along the Weather Hills, the Great Road, and the lower Hoarwell.  It is said at this time Rivendell was besieged." ~The Return of the King (Appendix A)

 

But the Elves fought back and turned the hoards of Angmar away, and Rivendell was preserved.

 

"It is said that Angmar was for a time subdued by the Elvenfolk coming from Lindon; and from Rivendell, for Elrond brought help over the mountains from Lórien.  It was at this time that the Stoors that had dwelt in the Angle (between Hoarwell and Loudwater) fled west and south, because of the wars, and the dread of Angmar, and because the land and clime of Eriador, especially in the east, worsened and became unfriendly.  Some returned to Wilderland, and dwelt beside the Gladden, becoming a riverside people of fishers." ~The Return of the King (Appendix A)