Military service is compulsory in France and all males between the ages of 20 and 48 years must serve three years in the army, the only cause for exemption being physical disability. Following the active service the soldier passes to the reserve for 11 years, after which he is seven years in the Territorial army and seven years in the Territorial reserve. The training in the active reserve consists of two periods of training and maneuvers which last for four weeks each, in the Territorial army one period of two weeks, and in the Territorial reserve, no fixed period. There are more than 2,000 reservists per battalion produced by the length of the reserve service, and when the troops are mobilized the active units can be easily maintained at full war strength. The number available in this way gives enough men for each battalion and regiment in the field with enough men left over for routine home guard work. FRENCH MILITARY DIVISIONS. There are two infantry regiments, composed of from six to eight battalions, to the brigade, in the French army, with two brigades to a division and two divisions to an army corps. A field artillery regiment, consisting of nine batteries of four guns each, is attached to each division. With nine field and three howitzer batteries and six reinforcing batteries added under mobilization, each corps on a war footing has 144 guns. There is also added to every army corps in the field one cavalry brigade of two regiments, one cavalry battalion, engineer companies and sanitary and service troops. The cavalry divisions are composed of three brigades of two regiments each--together with three batteries of horse artillery. There is in an army corps, when mobilized, approximately 33,000 combatants, and in a cavalry division 4,700 men. An aeronautical corps in the French army consists of 334 aeroplanes and 14 dirigibles. In the Reserve army at the time of mobilization there were two divisions in each region, corresponding to those in the active army. When they were mobilized the 36 reserve divisions contained virtually the same organization and strength as the troops of the line. There were a large number of troops for garrisoning the various fortresses when the regional regiments, engineers and foot artillery were utilized for this work. The Territorial army also consists of 36 divisions and garrison troops. When the remaining men of the Reserve and Territorial armies were summoned to the depots they were available to maintain the field army at full strength. In the French field army there were 20 army corps, a brigade consisting of 14 battalions, and 10 divisions of cavalry, when war was declared. When this was raised to its full war strength the active army numbered 1,009,000 men, the reserves and depots 1,600,000, the Territorial army 818,000, and the Territorial Reserve 451,000, a grand total of 3,878,000 soldiers. At this critical time, therefore, France had at her command about 5,000,000 trained men.