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 and many of those works were known to military leaders in colonial America. The British Army also brought European methods of war to North America before the Revolutionary War, and the colonists adopted much of that practice and doctrine in developing their own divisions and brigades as command and control units.

Against this background, Chapter 1 surveys the types of brigades and divisions the Army employed in the various wars of the eighteenth and nineteenth centuries. These units and the doctrine underlying them were the basis for organizing and maintaining permanent divisions and brigades in the twentieth century Chapters 2 through 14 trace the evolution of United States Army divisions and separate brigades from approximately 1900 to 1990. Their various reorganizations and their roles in the total Army are the grist of the study Chapter 15 draws together some of the lessons explored in the main body of the volume. Since the manuscript was prepared seven years ago momentous changes have occurred in the Army, and a brief look forward examines some of them.

The word "division" over the years has had many meanings within the Army, as well as within the other military services. As used in this study, the term addresses only a large, combined arms team capable of independent operations. But an integral part of the story is also the development of the "brigade," initially a command and control headquarters for two or more regiments or battalions from the same arm or branch. In the mid-twentieth century the brigade evolved into a combined arms unit smaller than a division. The combined arms brigade, although a relatively new structure, is also a subject of this study.

A few words need to be said about the charts and tables in the volume. Tables of organization and equipment (TOE) published for divisions and separate brigades and their subordinate elements served as the skeleton for the study, and the charts were derived from them. No one table, however, contains all the information that appears in each chart. Therefore, to develop each chart, I began with the largest unit, such as the division, and compiled the data for each subordinate element down to and including company, troops, battery, or detachment. The charts, nevertheless, represent only windows in time, for the organizations constantly changed. The tables listing divisions and brigades, their location, maneuver elements, and other information were also drawn from many sources. Hence, they are not attributed to any particular work or document.

Many colleagues have served as mentors in the research and writing of this manuscript. To name everyone who assisted in the work is impossible, but key supporters in the Center of Military History have been Morris J. MacGregor, Acting Chief Historian of the center in 1989–90; Dr. David Trask, former Chief Historian; and Lt. Col. Clayton R. Newell, former Chief, Historical Services Division. I am also indebted to Col. Raymond K. Bluhm, Colonel Newell's successor, who read the manuscript and offered insightful suggestions, and to Dr. John T. Greenwood, who arranged space and support for me within the center after I retired to complete the work. Janice E. McKenney, Chief, Organizational History