Each picket should maintain connection by patrols with the outguards
on its right and left.

=1074. Intercommunication.= It is most important that communication
should be maintained at all times between all parts of the outpost,
and between the outpost and the main body. This may be done by
patrols, messengers, wire or signal.

The commander of the outpost is responsible that proper communication
be maintained with the main body, and the support commanders keep up
communication with the outguards, with the adjoining supports and with
the reserve. The commander of a detached post will maintain
communication with the nearest outguard.

=1075. Changes for the Night.= In civilized warfare, it is seldom
necessary to draw the outpost closer to the main body at night in
order to diminish the front; nor is it necessary to strengthen the
line of observation, as the enemy's advance in force must be confined
to the roads. The latter are therefore strongly occupied, the
intervening ground being diligently patrolled.

In very open country or in war with savage or semi-civilized people
familiar with the terrain, special precautions are necessary.

=1076. Relieving the Outpost.= Ordinarily outposts are not kept on
duty longer than twenty-four hours. In temporary camps or bivouac they
are generally relieved every morning. After a day's advance the
outpost for the night is usually relieved, the following morning when
the support of the new advance guard passes the line of resistance. In
retreat the outpost for the night usually forms the rear guard for the
following day, and is relieved when it passes the line of observation
of the new outpost.

Outguards that have become familiar with the country during the day
time should remain on duty that night. Sentinels are relieved once in
two hours, or oftener, depending on the weather. The work of patrols
is regulated by the support commander.

Commanders of the various fractions of an outpost turn over their
instructions and special orders, written and verbal, to their
successors, together with the latest information of the enemy, and a
description of the important features of the country. When practicable
the first patrols sent out by the new outposts are accompanied by
members of the old outpost who are familiar with the terrain. When
relieved the old outguards return to their supports, the supports to
the reserve and the latter to the main body; or, if more convenient,
the suppo