A word of caution for the timid - the following tale is one of a battle, as told from the points of view of those who were there. It is not exceptionally graphic, but I do feel it should be mentioned for the peace of mind of the reader.
The recent history of Roanoak, and even Equestria, are filled with relative peace and prosperity; but there are reasons for the castles and the guards, for peace and prosperity must be earned - and often at great expense.