Two Tandaran patrol ships
Tandaran patrol ships are a type of vessel utilized by the Tandarans during the mid-22nd century.
Enterprise was attacked by two vessels of this class in 2151, while attempting to rescue Jonathan Archer and Travis Mayweather from a Tandaran internment camp. Despite being outnumbered, Enterprise was able to inflict enough damage to these vessels to force them to land on the planets surface for repairs. (ENT: "Detained")