How successful was the Roman army?

In this lesson students challenge an interpretation made by the History Channel. The lesson is set-up by students watching a minute long introduction to a documentary. They then spend the lesson trying to test the interpretation presented. The end result is that students write a letter to the History Channel advising whether their statement was right or wrong. I taught this lesson to some able Y6 students but it work equally well for Y7 and Y8 if desired. Example student work attached. All images acquired from a search engine filtered to "labelled for re-use" Comments are appreciated.