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

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h. The platoon is capable of preparing obstacles and installing
minefields. The use of demolitions for the destruction of bridges,
felling trees, and cratering roads should be considered by the platoon
leader. The use of such demolitions must be coordinated with
higher headquarters and be in consonance with the overall plan
of defense. If authority is received from higher headquarters, the
platoon leader may install protective minefields. Such minefields
are covered by platoon direct fire weapons. Smoke may be used
to reduce effective enemy observation and to confuse the enemy
forces. The platoon should continue to strengthen the defensive
positions as long as time permits.
124. Platoon Order for Defense
The platoon leader issues his order orally to the key noncommissioned
officers of the platoon while at the position to be defended.
This enables the platoon leader and section and squad
leaders to become thoroughly familiar with the area and reduces
the possibility of misunderstanding. The order should be issued
in time to permit the section and squad leaders to make a reconnaissance
of the area to be defended.
125. Conduct of Defense
a. The success of the platoon defense depends largely on the organization
of the position and on the effective use of the firepower
available. The defense must be conducted aggressively. The platoon
leader must take advantage of enemy mistakes. The enemy
should be engaged continuously from the time he is within effective
range of available weapons. The platoon continues to defend
its position until directed to move by higher authority. Within
the platoon position, however, the platoon leader may adjust his
forces as the situation develops.
b. Defensive fires of the platoon are coordinated to ensure maximum
effective fire during both daylight and darkness. Mutually
supporting tanks cover the probable avenues of armor approach.
Interlocking bands of machinegun fire should cover the entire platoon
sector. The mortar places fires into areas which cannot be
reached by other weapons of the platoon, particularly covered
areas in which the enemy might assemble or advance through.
c. In defensive situations, the platoon provides its own local
security. The scouts will usually provide security to the front and
flanks, and the support squad to the rear.
126. Platoon Blocking Positions and Roadblocks
a. Blocking Positions. A blocking position is organized to deny
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