During the early stages of World War I some soldiers began to exhibit strange symptoms; for example, they were panicked, crying, and fearful, and they showed the inability to reason, sleep, walk, or talk. They also experienced flashbacks of traumatic memories. Some suffered from serious tremors, amnesia, and depression and were hypersensitive to noise. According to McLeod (2004) by December 1914, 7 - 10% of all officers...