Battle of Procyon V

The Battle of Procyon V was the final battle between the United Federation of Planets and the Sphere Builders, wherein the forces of the Federation were able to successfully drive the Builders back into their trans-dimensional realm, in the year 2554.

The Battle
The Sphere Bulders fleet engaged the task force soon after, at the outskirts of the Prcyon system. The fleet opened fire, but to minimal effect. The defense perimeter was quickly shattered, with numerous ships being lost, as the Spheres unrelentingly continued on towards Earth. The surviving ships, including the USS Independence and the USS Defiant-D, assaulted the cube all the way to the orbit of Procyon V. Realizing that the battle was not progressing well, Starfleet Command ordered reinforcements, led by the USS Enterprise-J, to Procyon V.

By the time the reinforcements arrived, a large portion of the fleet had already been lost, including the flagship. However, by this point in the battle, the fleet had succeeded in destroying four spheres, leaving only two spheres operable. Both of those speres had been their outer hull´s heavuly damaged, causing fluctuations in the cube's power grid.

Meanwhile, in 2154, as Captain Jonathan Archer was preparing to undertake a suicide mission to destroy the Xindi weapon in the Delphic Expanse, Temporal Agent Daniels transported Archer through time to the Enterprise-J, which was participating in the battle, to witness the historic occasion. During this visit, Daniels revealed to Captain Archer that in the future, the Federation would be responsible for the success in averting a galaxy-wide takeover by the Sphere Builders. He managed to convince Archer to take with him a relic from the future, and return to 2154.

The captain of the Enterprise-J, taking advantage of historical notes about the Spheres stored in the Enterprise-J´s library, took command of the fleet and ordered all weapons to be targeted on a seemingly non-critical point on the cube. The resulting barrage destroyed the cube, though the explosion also claimed several nearby starships.