Multi-vector assault mode was a feature developed by Starfleet for its new Prometheus-class starship in the 2370s. By using advanced compartmentalization and automation systems, a ship capable of multi-vector assault mode could split itself into three separate warp-capable vessels, becoming an entire squadron operating semi-independently and in concert.
Upon ordering multi-vector assault mode, the ship's computer would begin a ten-second countdown, going to blue alert in preparation for the ship to separate. Separation was generally performed at sublight speeds, although it could be accomplished at warp as well. On the USS Prometheus, the saucer section detached, deploying two small warp nacelles; one on the dorsal side just behind the bridge, and the other in the same location on the ventral side of the saucer. The secondary hull split on the X-axis into two parts, each with two nacelles. Following the separation, the three separate sections could be piloted manually, or could be controlled by the ship's computer to perform pre-programmed attack patterns. After attack operations, the ship was capable of re-connecting itself automatically.
As of 2374, the multi-vector assault mode was still an untested, top-secret technology. The only starship known to be equipped with the system was the USS Prometheus itself. In its first two deployments (both unplanned due to a Romulan attack), the Prometheus successfully crippled the Nebula-class USS Bonchune (while under Romulan control) and destroyed a D'deridex-class Romulan warbird which was damaged by an Akira-class and two Defiant-class starships. (VOY: "Message in a Bottle").