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The Enterprise was able to deploy these new systems in 2378, prior to its mission to Romulus.
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A slight change in the warp nacelle pylons was also implemented. The major changes included 5 additional torpedo tubes and 4 additional phaser arrays. Sometime after the Enterprise's mission in the Briar Patch and before the engagement with the Reman warship Scimitar, a refitting of the Enterprise-E took place. While the Sovereign-class was not a key player in the Dominion War, such vessels as the Enterprise-E spent time during the war putting out diplomatic "brush fires" and extending the occasional olive branch, as the Federation Diplomatic Corps were busy attempting to put an end to the war. The Sovereign class first major engagements came in 2373, when the USS Enterprise saw action in the Borg incursion into Sector 001, and was instrumental in the destruction of the attacking cube. The Enterprise firing at the Borg cube at the Battle of Sector 001 It wasn't until the year 2409 that the Sovereign class was replaced by the Odyssey-class as Starfleet's leading class. As of 2373, it was Starfleet's most advanced vessel type. Proving to be highly successful against the Borg, the Sovereign was hailed as one of the "best balances of exploration and tactical capability since the Constitution-class of a century prior" and was expected to be Starfleet's leading class well into the 25th century. The Enterprise later faced the Borg during their incursion of Federation space in 2373.
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The prototype USS Sovereign was finally launched in 2370, followed two years later by the USS Enterprise-E. The Sovereign-class USS Enterprise-E was built at the San Francisco Fleet Yards and was launched from that facility on stardate 49827.5. The Sovereign-class was introduced during the early 2370s, and was, at the time, the most advanced starship design in the fleet. The Enterprise in drydock over Earth in 2378
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