Years prior to 2159, the Vulcans established an orbital dilithium mining base within the Tyburn system, fitted with a cutting beam which was used to penetrate planets' surfaces and expose dilithium deposits, as well as a series of four sensor platforms; sensor array 12, sensor platform 2, sensor platform 19 and sensor platform 82. These platforms were powered by an early form of nuclear fusion and orbited by a set of sensors.
In 2159, during the Earth-Romulan War, the Romulan Imperial Fleet made a big push into strategic sectors, including Tyburn, apparently on a course for Earth. Fortunately for Starfleet, a task force of vessels led by the NX-class Enterprise NX-01 arrived and covered the orbital facility. Meanwhile, the unmanned sensor platforms were brought online remotely with their command functions reprogrammed configured to respond to a strategically timed coded hailing frequency which triggered their detonation, resulting in a nuclear blast which created an electromagnetic pulse that disabled the Romulan vessels.
In addition, three Romulan cargo ships were decloaked, heading out of the system at impulse speeds. Deducing that the cargo ships were carrying the remainder of the Romulan toxin, Starfleet found that they were protected by shield generators designed for deployment on outposts. While the Starfleet vessels were unable to destroy the cargo ships, they were able to keep them within the limited range of the facility by concentrating fire on their engines, inflicting enough moderate damage to render them temporarily dead in space, thus slowing them down long enough for the mining base's cutting beam to destroy them. (ST video game: Legacy)