I still recall the days the first ships arrived. They looked massive on the small TV we had back then. I imagine they were much larger in person, as they landed over the large cities of the world. Beijing, London, and San Francisco were the first to see the mammoth metallic door open. They were also the first to be destroyed, by the strange blue beam the ships propelled outward.  That was when the world realized these visitors were hostile, and the war for survival began.