I've been working on a plan to re-take and secure the cities of Portland and South Portland, Maine within two years after the Zombie apocalypse. It assumes survival and ooperation on 1% of the population of the metro area (2,500 people) on the three main harbor islands. The plan begins with a scavenging trip up Long Creek to the National Guard armory at Clark's Pond (about 3 mi from the mouth of the harbor) then progresses with a beachhead at the Spring Point jetty in South Portland. From there, a sweep and secure operation of the campus of Southern Maine Community College, especially the metal shop, the greenhouses, and the biomass boiler with its electric cogeneration plant. Working our way up the point, we establish a defensible perimeter at the narrowest part of Spring point, which is only about 500 yards wide, surrounded by ocean on three sides, and leaves the college and the local Coast Guard base in our defended territory. When this is complete, we cross the harbor, making landfall at Fort Allen, and begin securing Downtown Portland. Since the downtown area is located on a peninsula and connected to the mainland only by a strip of land about 1500 meters and four bridges Two of them Drawbridges, I'm relatively certain that a force of 500, given no more that 24 months, could take and secure the area.