The Forgotten War is set in the "Golden Age" of the Third Imperium (1105-1116) in the Spinward Marches against the backdrop of the Fifth Frontier War with the Zhodani Consulate. Set in District 268, the crew of the Far Trader Spinward Rebellion have just been drafted by the Imperial Navy into service as a naval auxilliary.

The District 268 Navy is stretched to the limit trying to guard the border. At least it is a relatively quiet area of the Marches... or so the characters have been told. Their first assignment is to deliver a marine squad and supplies to a marine forward base deep in District 268, a mission that could be fraught with danger...