Was overrun by a combination of Orks and CAHYOOS. Also had a rather amusing in-character chat with the chaos player:
Chaos:Lackey of the False Emporer! Surrender now or die!
Myself: Like hell heretic! My men and I die standing!
Chaos: You have 100 Chaos marines, 20 squads of Demons, and a group Obliterators closing on your base
Chaos: Not counting what the warboss is throwing against you
*At this point a Squiggoth enters the fray and destroys the factory that had a Baneblade at 99%*
Warboss: WAAAAAAAAAAAAAAAAGHHHHHHHHHHHHH
Myself: I'll admit, things do look rather grim.
Chaos: So surrender! Offer your soul up to the dark gods and you shall be saved!
*At this point the Squiggoth has started attacking Chaos, turning my base into a massive
Mêlée à Trois*
Warboss: Zog it! Kill da chaos boyz az well! WAAAAAAAAAAAAAAAAGGGGHHHHHHHHHHHHHh
Myself: Well thank the Emperor for THAT
Myself: You alien allies have betrayed you Heretic!
Myself: Lay down your arms and surrender to the Emperor's mercy!
Chaos: Not for all the pleasures of Slaanesh!
*battle continues to rage, I fall back from my outer base towards the inner and start mass-producing Gaurdsmen and Commissars, letting chaos and orks kill each other*
*Chaos wins and starts up his attacck again*
Chaos: I say again, Surrender or die!
Myself: No! Death or Glory!
*battle rages back and forth. Eventually it's just my general+his preachers and psyker, a unit of Ogryns, a unit of Kasrkin, and 1 poor bloody gaurdsmen+angry flashlight+T-Shirt VS a horde of cultists and Marines*
Chaos: ((I don't think I can come up with a suitably epic conclusion to this battle, considering the number of defiler artillery I have))
Myself:((I can))
Myself: Fix Bayonets!
Chaos:((You aren't))
Myself: FOR THE EMPEROR AND TERRA! CHARGE!
*cue epic last stand. Bizarely the lone gaurdsman survived most of the engagement and the Ogryns went down first. Most of the general's unit died when some Berserkers entered the fray, but the general somehow managed to hold his own till everyone else in the army was dead*
Dawn of War I Multiplayer