The world of Gerrha is engulfed in a long, slow war of attrition against alien invaders; biomechanical horrors who cannot be negotiated with.

The invaders are mostly drones, directed through command and control hubs; one such hub has been installed in the former fortress on Death’s Head Island. If a tactical team can perform an amphibious assault and sabotage the hub, the invaders in this region will be overwhelmed.