Ah, the zombie plan. First thing, build my defenses (large wall, mini moat, elevated position). Second thing, gather supplies when I first get wind of an impending attack. Then, gather some people, explain to them what will happen. And when the zombies finally come - we fight on. Also, if somehow the zombies win the war, I have a cave in the yukon specially prepared to use as a living space, with supplies to last around 40-50 years.