For those of you who have cable TV, the Military Channel has a series called "The First World War" which is wonderful. It has lots of film, including some amazing battlefield footage. A recent episode talked about the initial German advance into Belgium and how they used Krupp's Big Bertha guns to completely demolish the concrete bunkers around Liege and other Belgian towns. It's a great show, full of information, including lots of letters and journals of various participants read aloud. Another Military Channel show to watch is called "The Trench" if you can catch it in reruns.