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.
Having dealt with the planet's defences, a strike force of Klingon battlecruisers moves into position to attack the Federation colony on the planet Arcanis. The Four Years War has begun.
The Federation's rapid expansion in the early 23rd Century came as a complete surprise to the Klingon Empire. The minor powers of the Alpha Quadrant had historically been of little interest to the Empire, and the formation of the Federation was at first considered nothing more than a political alliance. When the Federation failed to collapse, and worse, started gaining territory and resources at a rate far outshining the Empire's own, the High Council began viewing the Federation as a potential adversary.
Tensions continued to rise as the Federation began claiming territory closer and closer to Klingon space. The Klingons saw such rapid expansion on the Federation's part as an act of aggression, and claimed that those world's were, by right, the property of the Klingon Empire. The Federation disagreed - no formal claims had been made on the region prior to Federation colonisation - and denied taking any aggressive action towards the Empire. Despite Federation diplomats' attempts to quell the Empire's anger, a breaking point was finally reached in 2241, when the Klingons launched an assault on Federation space. Their target - Arcanis.
The attack on Arcanis was brutal. A highly populated and prosperous Federation colony, the Klingon fleet swept Arcanis' meagre defences aside with ease and then proceeded to rake the colony with disruptor fire from orbit - a bombardment that lasted several hours. Thousands upon thousands of Federation citizens were killed. The survivors endured under Klingon rule for four long years.