A group known as "L'Enfants Diabolique" are attempting a mass demon summoning, to create a platoon of Possessed soldiers. The mission to take them down is dubbed Operation Deus Volt by the Americans.
Silas joins other occultists and a special US Army detachment to defeat "L'Enfants Diabolique".
The Allies are victorious. A few of the occultists, just as John Harkin, will go on to work with Silas in the Accord.