This thesis examines the development of U.S. Army field artillery doctrine from 1917 to 1945. It compares field artillery organization, liaison methods, target acquisition methods, missions, command and control principles, and fire direction techniques employed in World War I, the interwar period, and World War II. The study reveals the remarkable continuity of the artillery doctrine developed in World War I. In spite of tremendous technological change from 1917 to 1945, World War II artillery doctrine remained very similar to the doctrine of 1918. The study concludes that the basic principles of artillery doctrine established in World War I were the basis for artillery doctrine in World War II, and will probably remain the basis for future artillery doctrine. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.