The Gunboats were used by the Alliance to infiltrate a secret Imperial base where the Shield X project was being conducted. There they captured the CR90 corvetteBlade 5, which bore the mechanism.
The corvette was renamed Ram's Head, and after final preparations by technicians from the corvette Libra, she was then sent to ram an array of Star Destroyers docked in the Imperial Drydock IV. The operation was a total success, as the Ram's Head caused enormous damage to each of the Star Destroyers by tearing apart their towers.
It is unknown what happened to the Ram's Head as it was not destroyed and was seen traveling into space without a crew.