USS Lexington (NX class)

The USS Lexington was an starship in service to the United Earth Starfleet in the mid-22nd century. It was one of the four remaining NX-class ships in active service in 2160. 

The Romulan War
Following the declaration of war against the Romulan Star Empire on June 1, 2156, Admiral Rafael Douglas cherry-picked individuals from the influx of labor to the Utopia Planitia yards to spur the construction of the NX-class fleet. Less than three weeks after the declaration the USS Lexington and USS Defiant (NX class) were launched.

While slower ships defended Sol, the Warp 5 fleet stayed outside the system. 

On 10 January in the year 2160, the Lexington led a fleet of Denobulan warships towards Romulus in a bid to get the Romulans to retreat from the Battle of Cheron and defend their homeworld. The ruse was successful and enabled the USS Enterprise and USS Atlantis to destroy the and disable the  as they withdrew from. When the remaining three warbirds were on their way to Romulus, the Lexington and its fleet turned back.