From the website:
The Resistance is a complex, characterful and disparate assortment of human survivors on the Cradle Worlds and Earth itself, currently occupied by the dreaded alien Scourge. The very existence of the Resistance has shaped UCM military planning for its Reconquest, which became a war of liberation rather than simply a war of revenge as soon as they were discovered. Indeed, the Resistance alone are responsible for a reconquest being possible at all, as they were able to activate and maintain foldspace nodes on all but one of the Cradle Worlds, allowing UCM invasion fleets to jump to their locations accurately. Theirs is a tale of loss, grit and determination to survive in the face of insurmountable odds.