Battle of Cheron (mirror)

This event was fought between Earth and ch'Rihan in the Mirror Universe in 2160. A fortnight after it began, ch'Havran was utterly destroyed. The War itself, however, continued and was still going when The United Empire of Planets (and possibly Starfleet) was incorporated in 2161. The battle ended in victory for Earth in 2162 and saw all of ch'Rihan's inhabitants commit mass suicide (TNG novel Dark Mirror).

The book 'The Best of Trek # 14' ''says that the 'Romulan War' ended at the boundaries of the 'Romulan Federation' as a victory for Earth. On the brink of extinction, the Rihannha then surrendered to the regime of Emperor Joachim''.