ISS Arnold

In the mirror universe, The ISS Arnold was a $𝜇$ Imperial frigate in service to the Imperial Starfleet in the 24th century. 

Service history
The Arnold was assigned to a task force, under the command of $𝜇$ onboard the  and along with the , sent to recapture the  that had been commandeered and stolen from drydock by Captain $𝜇$, the former commander of Stargazer, and loyalist members of his crew. When the task force caught up with the Enterprise, the starship was easily able to weather their combined attack and inflict significant damage on the Horatio and the Stargazer in return. However, the engagement was interrupted by the arrival of an Alliance fleet consisting of numerous Galor- and starships, as well as Klingon bird-of-preys.