Second Siege of Imladris

The Second Sige of Imladris took place between TA 1356 and TA 1409 where the forces of the Witch-king of Angmar and his ally Rhudaur besieged the elven stronghold of Rivendell. Few details are known, but the siege was finally broken when Elrond brought reinforcements over the mountains from Lothlórien and temporarily subdued Angmar.