Battle of Wolf 359 (mirror)

Battle of Wolf 359 (mirror) according to the Shatnerverse continuity, was when the last defenses of the Terran Empire were compromised. Leaving Starfleet (mirror) and Earth vulnerable to the combined force of the Klingon-Cardassian Alliance. The death toll in this reality was higher, as well as the number of vessels lost. This happened approximately 30 years-plus earlier than the battle which occured in the "primary" Universe.