Ultimately, this would prove to be a huge disadvantage. Due to these attacks being located near the country sides instead of the urban areas, the military for most respective countries relocated their civilians to the cities for much better protection. With multiple masses of Xen lifeforms teleporting to the Earth, the military already had much to attend and hold off. Let's assume that the events of Half-Life take place in 2009, since that, to me, makes the most sense, as they have progressed farther in their universe than we have in ours, but only by six years. The entire Combine empire is a force that is truly to be reckoned with.
