In late 2373, the B'Moth was attacked by the Jem'Hadar while on patrol at the Cardassian border. Disabled and on emergency power only, the cruiser drifted across the border into Cardassian space. The IKS Rotarran found the B'Moth three days later, and rescued thirty-five survivors. (DS9: "Soldiers of the Empire")
Background information Edit
According to the script for this episode, the pronunciation for B'Moth was "buh-MOTH". 
While the Rotarran rescued the surviving crew of the B'Moth, the fate of the ship itself is unclear, as the Rotarran apparently did not tow the B'Moth back to Deep Space 9. Most likely, the ship was either abandoned or destroyed to prevent its capture.
According to the Star Trek: Star Charts (p. 63) and the Stellar Cartography: The Starfleet Reference Library ("Federation Historical Highlights, 2161-2385"), there was a star system named B'Moth, which might be the possible origin for the name of this starship, in the Beta Quadrant. It was a binary system with an A-class star and an M-class star.
|IKS Amar • IKS B'Moth • K'Nera's battle cruiser • Kang's battle cruiser • Kronos One • IKS T'Ong • Unnamed|