Route marches,--2d.

Marches within reach of the enemy.

The former belong to the domain of strategy; the latter to that of tactics; both, however, are connected with logistics in every thing that concerns the means of their execution.
When an army is moving on a line of operations, it should be in as many columns as the facility of subsistence, celerity of movement, the nature of the roads, &c., may require.

Large columns cannot move with the same rapidity as smaller ones, nor can they be so readily subsisted.

But when an army is within striking distance of the enemy, concentration becomes more important than celerity, and the forces must be kept in mass, or at least within supporting distances of each other.