4 films match Ironclad

In 13th century a determined group of Knights Templar defends Rochester Castle against the tyrannical King John. (imdb)

A survivor of the Great Siege of Rochester Castle who has to fight to save his clan from the Celtic raiders. (matadorpictures.com)

A naval battle between two large ships: the "Monitor" and the "Merrimack". (imdb)

During the US civil war, Elinor, a pretty northern girl, comes south to visit her aunt. Little does anyone know, but she's a spy. Lt. Yancey, who's close to being engaged to the fetching and resourceful Rose, is gallant enough to show the Yankee guest around, including a walk down a hidden creek where a gunboat is built and awaits powder. Elinor sends this intelligence north, and the Blue Coats attack. (imdb)