This map lets you defend the Mini version of Minas Tirith by a hoard of orcs. But in this case macemen. Your enemy for this siege is Duc Truff since he is the master of macemen. There are over 1000 macemen which you will have to defeat to defend the city of Gondor.
Note: I porposely didn't make the walls of Minas Tirith perfectly round because I wanted all the archers to get a chance to fire.
IMPORTANT: Allthough this map is marked "Siege" you will find it in the "Invasion" section of Stronghold.