Brian N. Hall, Communications and British Operations on the Western Front, 1914-1918. Cambridge, UK: Cambridge University Press, 2017.

David Retherford has an undergraduate degree in History of Science from the University of Florida. He also has a Master’s degree in War Studies from the University of Birmingham in the UK. David is currently pursuing a second masters by research at the University of Birmingham and is conducting research into the development of American combat intelligence tactics in the First World War. David lives and works in Tampa Bay, Florida with his family.