This Leavenworth Paper is a critical reconstruction of World War II Ranger operations conducted at or near Djebel el Ank, Tunisia; Porto Empedocle, Sicily; Cisterna, Italy; Zerf, Germany; and Cabanatuan in the Philippines. It is not intended to be a comprehensive account of World War II Ranger operations, for such a study would have to include numerous minor actions that are too poorly documented to be studied to advantage. It is, however, representative for it examines several types of operations conducted against the troops of three enemy nations in a variety of physical and tactical environments. As such, it draws a wide range of lessons useful to combat leaders who may have to conduct such operations or be on guard against them in the future. Many factors determined the outcomes of the operations featured in this Leavenworth Paper, and of these there are four that are important enough to merit special emphasis. These are surprise, the quality of opposing forces, the success of friendly forces with which the Rangers were cooperating, and popular support.

This paper focuses on the formulation of doctrine since World War II. In no comparable period in history have the dimensions of the battlefield been so altered by rapid technological changes. The need for the tactical doctrines of the Army to remain correspondingly abreast of these changes is thus more pressing than ever before. Future conflicts are not likely to develop in the leisurely fashions of the past where tactical doctrines could be refined on the battlefield itself. It is, therefore, imperative that we apprehend future problems with as much accuracy as possible. One means of doing so is to pay particular attention to the business of how the Army's doctrine has developed historically, with a view to improving methods of future development.

In the seventy years that have passed since the tank first appeared, antitank combat has presented one of the greatest challenges in land warfare. Dramatic improvements in tank technology and doctrine over the years have precipitated equally innovative developments in the antitank field. One cycle in this ongoing arms race occurred during the early years of World War II when the U.S. Army sought desperately to find an antidote to the vaunted German blitzkrieg. This Leavenworth Paper analyzes the origins of the tank destroyer concept, evaluates the doctrine and equipment with which tank destroyer units fought, and assesses the effectiveness of the tank destroyer in battle.