ed before dark and the change made at dusk. However, a
change in the position of the outguard will be exceptional.

=1062.= _Sentinels_ are generally used singly in daytime, but at night
double sentinels will be required in most cases. Sentinels furnished
by cossack posts or sentry squads are kept near their group. Those
furnished by pickets may be as far as 100 yards away.

Every sentinel should be able to communicate readily with the body to
which he belongs.

Sentinel posts are numbered consecutively from right to left in each
outguard. Sentry squads and cossack posts furnished by pickets are
counted as sentinel posts.

If practicable, troops on outpost duty are concealed and all movements
made so as to avoid observation by the enemy; sentinels are posted so
as to have a clear view to the front and, if practicable (though it is
rarely possible), so as to be able, by day, to see the sentinels of
the adjoining outguards. Double sentinels are posted near enough to
each other to be able to communicate easily in ordinary voice.

Sentinels are generally on duty two hours out of six. For every
sentinel and for every patrol there should be at least three reliefs;
therefore, one-third the strength of the outguards gives the greatest
number of men that should be on duty as sentinels and patrols at one
time.

Skillful selection of the posts of sentinels increases their field of
observation. High points, under cover, are advantageous by night as
well as by day; they increase the range of vision and afford greater
facilities for seeing lights and hearing noises. Observers with good
field glasses may be placed on high buildings, on church steeples or
in high trees.

Glittering objects on uniform or equipment should be concealed. It is
seldom necessary to fix bayonets, except at night, in dense fog, or in
very close country.

Reliefs, visiting patrols, and inspecting officers, approach sentinels
from the rear, remaining under cover if possible.

=1063. Reserve.= The reserve forms a general support for the line of
resistance. It is, therefore, centrally located near the junction of
roads coming from the direction of the enemy, and in concealment if
practicable.

Of the troops detailed for outpost duty, about one-half of the
infantry, generally all of the artillery, and the cavalry not
otherwise employed, are assigned to the reserve. If the outpost
consists of less than two companies the reserve may be omitted
altogethe