Thirty brigades formed in fifteen divisions of two brigades each will have only fifteen brigades in the first line, while the same thirty brigades formed in ten divisions of three brigades each may have twenty brigades in the first line and ten in the second. But it then becomes necessary to diminish the number of divisions and to have but two in a corps,—which would be a faulty arrangement, because the corps is much more likely to be called upon for independent action than the division.

Every army has two wings, a center, and a reserve,—in all, four principal subdivisions,—besides accidental detachments.

Below are some of the different formations that may be given to infantry.

1st. In regiments of two battalions of eight hundred men each:—

Div's. Brig's. Batt'ns. Men. Four corps of two divisions each, and three divisions for detachments11 = 22 = 88 = 72,000 Four corps of three divisions each, and three divisions for detachments15 = 30 = 120 = 96,000 Seven corps of two divisions each, and one corps for detachments16 = 32 = 128 = 103,000 2d. In regiments of three battalions, brigades of six battalions:—

Div's. Brig's. Batt'ns. Men. Four corps of two divisions each, besides detachments11 = 22 = 132 = 105,000 Four corps of three divisions each, besides detachments15 = 30 = 180 = 144,000 Eight corps of two divisions each16 = 32 = 192 = 154,000 If to these numbers we add one-fourth for cavalry, artillery, and engineers, the total force for the above formations may be known.

It is to be observed that regiments of two battalions if eight hundred men each would become very weak at the end of two or three months' campaigning. If they do not consist of three battalions, then each battalion should contain one thousand men.