In Marathon 2, we hear numerous references to a planned invasion of Sol by the Pfhor.
Yet I warned Sol of its impending invasion,
and even stayed long enough to show the
UESG how to build Warp Capable Fusion
Missiles. I feel some strange loyalty to
humanity. - Durandal, Come and Take your Medicine (1st Terminal, 1st Message)
Durandal convinced us that this old
computer is our only link to the lost S'pht
clan, and that bringing back the lost clan
to fight against the Pfhor was our only
chance of stalling their invasion of Sol.
Nobody here wants to think about what would
happen if the Pfhor reached Earth.
- Robert Blake, This Side Toward Enemy (2nd Terminal, 1st Message)
The Pfhor invasion of Sol has been
recalled, and for now Earth is safe. But
man's respite from war means another
cataclysmic battle for the S'pht. The
slavers have not suffered a defeat like the
one we handed them today since the Nakh,
the last extant client race of the Jjaro,
rebelled six thousand years ago. - Durandal, All Roads Lead To Sol... (Terminal 1)
This raises two questions:
First, how did the Pfhor find out about Earth? They hadn't encountered humans until the events on Tau Ceti and the Marathon, so how would they know that Earth was the UESC homeworld?
Second, and less importantly, how did Durandal find out about this planned invasion?
Vale,
Perseus