FM 17-35 ( Armored Cavalry Platoon, Troop and Squadron ) 1960

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182. Conduct of Screening Mission
a. Small enemy patrols that approach the screen may be permitted
to infiltrate the line of observation posts. The observation
post or patrol that observes an enemy force reports its location
and progress. The observation post or patrol reporting the enemy
usually remains hidden so as not to disclose its location. Tanks,
infantry, and supporting fires are employed to destroy the enemy
patrol or drive it from the sector.
b. When an enemy force posing a threat to the main body
approaches the position, it is reported by the fastest means available.
Every effort is made by the screening force to develop the
situation and to obtain the strength, composition, disposition, and
direction of movement of the enemy force. Once contact has been
made, one or more observation posts may be assigned the mission
of remaining in contact with the enemy. The remainder of the
troop may reinforce the observation posts, with certain elements
designated by the troop commander to move with the enemy and
to report changes in the situation. When required, the entire
troop may be ordered to withdraw to a new line of observation
posts.
c. The troop commander should use all available fire support to
harass and impede the progress of the enemy.
d. Once contact has been gained with the enemy, it must be
maintained until the enemy moves out of the troop sector of
responsibility. Enemy movement that may affect another unit
must be promptly reported to higher headquarters.
183. Missions and Techniques
Section VII. REAR AREA SECURITY
a. General. An armored cavalry troop may be employed alone
or as part of a larger rear area security force that is protecting
a unit, locality, or installation in the rear area from surprise
attack, annoyance, or sabotage by enemy units, partisans, guerrillas,
or airborne troops. The troop commander must carefully
coordinate the efforts of the troop with those of other elements
in the area.
b. Securing Routes of Communication. The techniques employed
to guard routes of communication vary with the terrain,
the road net, the length of the routes of communication, and the
type of enemy activity expected. The following techniques form
the basis for plans to secure routes of communication.
120 AGO 4088B