Fall of the Cyber-Empire
The Fall of the Cyber-Empire was the final defeat of the Cyber-Empire at the end of the Cyber-Wars.
History
In the far future, during the Cyber-Wars, the Alliance, including Ko Sharmus, sent the Cyberium back through time and space in order to keep it out of the hands of the Cybermen and defeat them. (TV: Fugitive of the Judoon, The Timeless Children)
At some point after the Cybermen lost the Cyberium, humanity managed to defeat the Cyber-Empire which was "brought down to nothing, finally." (TV: Fugitive of the Judoon) The site of the Empire's greatest defeat was left filled with debris and dormant ships, including an intact Cybercarrier with an army of hundreds of thousands of Cyber-Warriors. (TV: Ascension of the Cybermen)
However, while humanity succeeded in defeating the Cyber-Empire, leaving the Cybermen nearly extinct, humanity was left near extinction as well from the war. (TV: Ascension of the Cybermen)
