New Scenarios Page: Medievals

I have finally managed to finish off a full description of the Callinicum scenario we ran last year for the Scottish Society of Ancients Battle Day. I've been doing parts of this every so often, and it is good to see it in completed form. I decided to make this one the first on a new medieval scenarios page, "medieval" being understood as anything that comes after the fall of the Western Roman Empire. I don't know how often I'll be able to add to this page; most of our games at the club are in the classical period because of availability of figures.