Order of Battle in August 1914

At the time of mobilization, there were 20 "metropolitan" (or, continental) army corps in France (1st-18th, 20th and 21st), each composed of two active infantry divisions. Each of these army corps was based in an assigned military region, there being 20 military regions throughout France. The 19th Corps was based in Algeria and is not listed below.

North-East Army Group (General Joffre)

1^st Army (Gen. Dubail)

7^th Corps (14^th, 41^st Divisions)
8^th Corps (15^th, 16^th Divisions)
13^th Corps (25^th, 26^th Divisions)
14^th Corps (27^th, 28^th Divisions)
21^st Corps (13^th, 43^rd Divisions)
6^th, 8^th Cavalry Divisions
44^th Division
1^st Reserve Group (58^th, 63^rd, 66^th Divisions)
Alpine Group

2^nd Army (Gen. de Castelnau)

9^th Corps (17^th, 18^th, Morocco Divisions)
15^th Corps (29^th, 30^th Divisions)
16^th Corps (31^st, 32^nd Divisions)
18^th Corps (35^th, 36^th Divisions)
20^th Corps (11^th, 39^th Divisions)
2^nd, 10^th Cavalry Divisions
2^nd Reserve Group (59^th 68^th, 70^th Divisions)

3^rd Army (Gen. Ruffey)

4^th Corps (7^th, 8^th Divisions)
5^th Corps (9^th, 10^th Divisions)
6^th Corps (12^th, 40^th, 42^nd Divisions)
7^th Cavalry Division
3^rd Reserve Group (54^th, 55^th, 56^th Divisions)

4^th Army (Gen. Langle de Cary)

12^th Corps (23^rd, 24^th Divisions)
17^th Corps (33^rd, 34^th Divisions)
Colonial Corps (1^st, 2^nd, 3^rd Colonial Divisions)
9^th Cavalry Division

5^th Army (Gen. Lanrezac)

1^st Corps (1^st, 2^nd Divisions)
2^nd Corps (3^rd, 4^th Divisions)
3^rd Corps (5^th, 6^th Divisions)
10^th Corps (19^th, 20^th Divisions)
11^th Corps (12^th, 21^st Divisions)
4^th Cavalry Division
38^th Division
4^th Reserve Group (51^st, 53^rd, 69^th Divisions)
52^nd, 60^th Divisions

G.H.Q. Reserve

Cavalry Corps (1^st, 3^rd, 5^th Cavalry Divisions)

War Ministry Reserve

61^st, 62^nd, 67^th Divisions

Mobile Defenses of the North-East

57^th, 71^st, 72^nd, 73^rd Divisions

14^th and 15^th Region Reserves

64^th, 65^th, 74^th, 75^th Divisions