|2238 2239 2240 2241 2242 2243 2244|
|2210s 2220s 2230s 2240s 2250s 2260s 2270s|
|22nd century - 23rd century - 24th century|
- Montgomery Scott joins Starfleet and begins his engineering career (TNG: "Relics")
- A starship disappears near the Taurean system (TAS: "The Lorelei Signal")
- The Four Years War between the Klingon Empire and United Federation of Planets begins with the attack on the Arcanis system by the Klingons. For twelve hours, disruptor fire from their orbiting D-6 Battle cruisers does not stop. Thousands are killed, many more wounded or missing. For the next two years, system after system falls to the unrelenting advance of the Klingon Imperial Navy. The tide of the war turns in favor of the Federation with the introduction of the Ares-class battle cruiser. The war ends in 2245 with the defeat of the Klingons at Axanar. (Star Trek: Axanar: Prelude to Axanar)
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