Detachment from main body to cover its advance.
Against surprise for information.
Push back small bodies.
Check enemy's advance until deployment in rear.
Seize good position and locate enemy lines.
Remove obstacles.
Strength 1-20 to 1-3 of entire command.

Divisions of Advance Guard:
Cavalry point.
Infantry point.
Advance party.
Support.
Reserve.

Leading Troops:
A detachment protecting the head of a column in retreat.

Rear Guard:
Detachments protecting the rear of a retreating column.
Formation like that of advance guard.

Flank Patrols:
Detachments for protecting the flanks of marching column.

March Outpost:
Detachments for protection of column halted on march.
Formation, that of the marching protection.

Outpost: