Prior to its capture by the Rebellion, it was an Imperial corvette known as Blade 5. It was stolen and used to ram an array of Star Destroyers docked in a shipyard. Technicians aboard the CR90 Corvette Libra modified it to lock coordinates on the shipyard, thus destroying all of the Star Destroyers in a row.
It is unknown what became of the Ram's Head as it was last seen flying into unknown space after the shipyard attack, still intact.
- Star Wars: X-Wing Tour of Duty: Imperial Pursuit (First appearance)