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Note 1: In his comment (below his answer), Jason Baker brings up an important point that bears repeating, and since he says it more clearly and concisely than I could ever hope to, I will quote him (almost) in full:.

The Shell-shocked Hobbit: The First World War and Tolkien's Trauma of the Ring (includes a speculative diagnosis of Post Traumatic Stress Disorder (first identified - and labeled "shell shock" at the time- among soldiers who, like Tolkien, had fought on the Somme) for Frodo).
http://www.thefreelibrary.com/The+shell-shocked+hobbit%3A+the+First+World+War+and+Tolkien's+trauma+of...-a0154698400

Note 1: In his comment (below his answer), Jason Baker brings up an important point that bears repeating, and since he says it more clearly and concisely than I could ever hope to, I will quote him (almost) in full:

The Shell-shocked Hobbit: The First World War and Tolkien's Trauma of the Ring (includes a speculative diagnosis of Post Traumatic Stress Disorder (first identified - and labeled "shell shock" at the time  - among soldiers who, like Tolkien, had fought on the Somme) for Frodo).
http://www.thefreelibrary.com/The+shell-shocked+hobbit%3A+the+First+World+War+and+Tolkien%27s+trauma+of...-a0154698400

The Shell-shocked Hobbit: The First World War and Tolkien's Trauma of the Ring (includes a speculative diagnosis of Post Traumatic Stress Disorder (first identified - and labeled "shell shock" at the time- among soldiers who, like Tolkien, had fought on the Somme) for Frodo).
http://www.thefreelibrary.com/The+shell-shocked+hobbit%3A+the+First+World+War+and+Tolkien's+trauma+of...-a0154698400