A well-organized General Staff, through which the Commander exercises his functions, is essential to a successful modern army. However capable our division, our battalion, and our companies as such, success would be impossible without thoroughly co-ordinated endeavor. A General Staff broadly organized and trained for war had not hitherto existed in our army. Under the Commander in Chief, this staff must carry out the policy and direct the details of administration, supply, preparation, and operations of the army as a whole, with all special branches and bureaus subject to its control. As models to aid us we had the veteran French General Staff and the experience of the British, who had similarly formed an organization to meet the demands of a great army. By selecting from each the features best adapted to our basic organization, and fortified by our own early experience in the war, the development of our great General Staff system was completed. The General Staff is naturally divided into five groups, each with its chief, who is an assistant to the Chief of the General Staff. G. 1 is in charge of organization and equipment of troops, replacements, tonnage, priority of overseas shipment, the auxiliary welfare association, and cognate subjects; G. 2 has censorship, enemy intelligence, gathering and disseminating information, preparation of maps, and all similar subjects; G. 3 is charged with all strategic studies and plans, movement of troops, and the supervision of combat operations; G. 4 co-ordinates important questions of supply, construction, transport arrangements for combat, and of the operations of the service of supply, and of hospitalization and the evacuation of the sick and wounded; G. 5 supervises the various schools and has general direction and co-ordination of education and training. The first Chief of Staff was Colonel (now Major Gen.) James G. Harbord, who was succeeded in March, 1918, by Major Gen. James W. McAndrew. To these officers, to the Deputy Chief of Staff, and to the Assistant Chiefs of Staff, who, as heads of sections, aided them, great credit is due for the results obtained, not only in perfecting the General Staff organization, but in applying correct principles to the multiplicity of problems that have arisen. ORGANIZATION AND TRAINING