The Fall of Assur occurred when the first city and old capital of the Neo-Assyrian Empire fell to Median, Babylonian, and other rebellion-led forces. The sack of the city that followed destroyed the city to some degree; however, it recovered during the Achaemenid Empire. The city remained occupied by Assyrians until the massacres of Tamurlane in the 14th century AD.
^ abHealy, Mark (1991). The Ancient Assyrians. New York: Osprey. p. 55.
^The Fall and Rise of Jerusalem: Judah Under Babylonian Rule "the Medes left Arrapha, attacked Kalhu (Nimrud) and Ninuwa (Nineveh), and continued rapidly northward to capture the nearby city of Tarbisu. Afterward, they went back down the Tigris and laid siege to Assur. The Babylonian army came to the aid of the Medes only after the Medes had begun the decisive offensive against the city, capturing it, killing many of its residents, and taking many others captive."
^Healy, Mark (1991). The Ancient Assyrians. New York: Osprey. p. 6.