In Normandy during World War II Field Marshal Montgomery had two classes of divisions. Some were veterans of North Africa, and others were green units, without previous combat experience. Montgomery initially tended to rely on his veteran units (particularly during the disastrous Operation Goodwood), but these units performed poorly, while his green units performed well. In this instance, failing to understand the influence of emotional exhaustion and the Well of Fortitude had a significant negative impact on the Allied effort in World War II.
