Defence_Destroyers.zip is a release file of the Minecraft map Defence Destroyers, made for Minecraft 1.4.7. It was published on April 14, 2013 and is 6 MB in size. For the full description, screenshots and every other version, visit the Defence Destroyers map page.
How to install: Extract the .zip and move the world folder into .minecraft/saves; the map then appears in your Singleplayer list.