The recently-created fortress tag is applied to only one question so far. However, it seems it me to be fairly meta: all I can tell from this tag is that there is somehow a fortress involved in the questions: not who lives there, what is happening to it, or how it's built; not how it relates to the world in question or the question in the world.
What do we think? Is it necessary? Its easy enough to clean it up if we decide we don't now, just removing it from the question will see it automatically deleted.