Combat stress reaction is a medical problem that happens to some soldiers because of the trauma of war. In the past, it was called battle shock, war neurosis, or battle fatigue. It causes both mental and physical problems. It is similar to acute stress disorder, and can often become post-traumatic stress disorder.
Combat stress reaction does not affect everyone equally. Sometimes it causes soldiers to be very unhappy. Sometimes it causes soldiers severe disability.
The acute (early) stage of combat stress reaction is the best time to keep things from getting worse. Since World War I, soldiers in early stages of combat stress reaction have usually been treated on the front lines - close to where combat is happening.[1]