However some less subjective data is available. Prior to World War II it had always been assumed that the average soldier would kill in combat simply because his country and his leaders have told him to do so and because it is essential to defend his own life and the lives of his friends. When the point came that he didn't kill, it was assumed that he would panic and run. During World War II U.S. Army Brigadier General S. L. A. Marshall asked these average soldiers what it was that they did in battle. His singularly unexpected discovery was that, of every hundred men along the line of fire during the period of an encounter, an average of only 15 to 20 "would take any part with their weapons." This was consistently true "whether the action was spread over a day, or two days or three." Marshall was a U.S. Army historian in the Pacific theater during World War II and later became the official U.S. historian of the European theater of operations. He had a team of historians working for him, and they based their findings on individual and mass interviews with thousands of soldiers in more than four hundred infantry companies, in Europe and in the Pacific, immediately after they had been in close combat with German or Japanese troops. The results were consistently the same: only 15 to 20 percent of the American riflemen in combat during World War II would fire at the enemy. Those who would not fire did not run or hide (in many cases they were willing to risk great danger to rescue comrades, get ammunition, or run messages), but they simply would not fire their weapons at the enemy, even when faced with repeated waves of banzai charges.