They were used to attack the encampments of clans they considered "terrorists" such as Zobral's clan inside the Cygniai Expanse. They usually began their bombardment after dark, which only lasted a few hours.
In 2152, Torothan cruisers were attacking encampments while Captain Jonathan Archer and Commander Charles Tucker III were visiting Zobral's settlement. After a series of attacks, they were still combing the desert the next day and flew over the two forcing them to hide in the sand. Captain Archer described the sound the cruiser made as "much bigger" than a shuttlecraft. (ENT: "Desert Crossing")