Who's Who in the Ancient Near East "It appears that Cyaxares did unite the Medes and achieved some impressive military victories. In 614 he attacked Nineveh and captured Ashur and Tarbisu"
The Ancient Near East: History, Society and Economy "already by 614 BC, the Medes of Cyaxares (Umakishtar in the Babylonian chronicle) had invaded the Assyrian cities, conquering Tarbisu and then Ashur, which was brutally sacked"