INFANTRY. Besides its Staff, which is the voice of the Command, a Division normally includes two brigades of infantry of two regiments each. The necessities of the present war have compelled the belligerents to reduce to three regiments many of their Divisions, and only the crack Divisions selected for attack have been kept up to four regiments. ARTILLERY. Each Division includes, under the command of a colonel: 1st. One regiment of field artillery with three groups, each of three batteries each of four 75 mm. cannon; 2d. One regiment of heavy artillery with one group of 155 mm. quick-firing cannon; 3d. One battery of trench guns, the number and the size of which vary. ENGINEERS. A French Division includes one half battalion of sappers and miners, which is not sufficient; two battalions at least ought to be attached to it. The rapidity and solidity with which the German entrenchments are constructed is due to the great number of engineer battalions which our enemy possesses. CAVALRY. A Division also includes two squadrons of cavalry. In the trenches they are dismounted and used as connection-agents (_agents de liaison_). Their duties will be considered at another point. AVIATORS. A Division ought to possess its own aviation corps; planes for reconnoitring, planes for directing the fire of artillery and the movements of infantry, and swift battle-planes without the protection of which all other flying-machines are exposed to great dangers. We cannot insist enough on the necessity for the American Army to be uncompromising concerning the perfect organization of its aviation. Reasons which we lack space to discuss have so far prevented the French section of aviation from having the complete general organization it ought to have. SUPPLY. All the services for the supply of munitions, and for the repair and renewal of material, are centralized in a divisional Park. To the supply of munitions we shall devote a special chapter. The supply of provisions is entrusted in a Division to a sub-commissary of stores. The Commissariat Department is part of the general service at the Army base, and its study would lead us beyond the limits assigned to this exposé. MEDICAL DEPARTMENT. Every Division has its own medical department. On this point, too, we shall abstain from entering into details. Let us however remark that the medical service is still susceptible of much improvement. In spite of continuous improvements in its organization, in spite of the generous assistance of our Allies, of neutral countries, and particularly of our American friends, the recent engagements have proven: 1st. The insufficiency of the means at hand for rapidly collecting the wounded on the battlefield; 2d. The insufficiency, near the battlefield, of large field hospitals for the operations that cannot be delayed;