Ages Of the Federation is a new series of total conversions to Sins Of A Solar Empire: Rebellion starting with "The Four Years War". The first mod in the series takes place between the Enterprise and Original series eras, focusing on the conflict between the early Federation and Klingon Empire. A Resurgent Romulan Star Empire, angry and still licking its wounds after its defeat to the federations waits in the shadows, ready to take advantage of a misstep by either the warring powers.
Starfleet openly strikes back at the Klingons.
With the new Ares-class providing a tactical edge, and better weapons and equipment distributed throughout the fleet, Starfleet was finally able to challenge the Klingons openly. Finally unleashed, Starfleet battlegroups held in reserve regrouped and struck back at the Klingons with their full force. The Klingons' steady advance, after two years of victories, ground to a halt.
This moment couldn't have come too soon - the Klingons were on the verge of invading the very core of Federation space. The strategic situation could hardly be more dire. The Federation could absolutely not afford to lose any more territory to the Klingons. In the simplest terms, if the Klingons continued to advance, the Federation faced almost certain defeat.
Fortunately, the technical advantage the Klingons had hitherto held over the Federation was gone - dozens of worlds working together in cooperation had allowed Starfleet to leapfrog Klingon technology. The fighting grew all the more vicious as Starfleet transitioned from guerilla tactics to engaging the Klingon fleet directly.
Such a change of pace was welcomed, most surprisingly, by the Klingons. Frustrated by delays and, frankly, starved of true challenge, Starfleet's new strength finally gave them what they had been craving - an open contest against a worthy foe. On both sides, it was as though a pressure valve had been released.
In war, however, there is nothing more honourable, or more glorious, than victory, and the Klingons understood the strategic situation all too well. Though Starfleet was now putting up a more entertaining struggle, the Federation was backed into a corner. One more deep thrust, and their enemies would fall before the Empire.
The line was drawn. The future of the Federation hung in the balance.