, position and number of
islands at suitable points of passage, heights in the vicinity and
their command over the banks.

=1002. Woods.= Their situation, extent and shape; whether clear or
containing underbrush; the number and extent of "clearings" (open
spaces); whether cut up by ravines or containing marshes, etc.; nature
of roads passing through them.

=1003. Canals.= Their direction, width and depth; condition of
tow-paths; locks and means of protecting or destroying them.

=1004. Telegraphs.= Whether they follow railroads or common roads;
stations, number of wires.

=1005. Villages.= Their situation (on a height, in a valley or on a
plain); nature of the surrounding country; construction of the houses,
nature (straight or crooked) and width of streets; means of defense.

=1006. Defiles.= Their direction; whether straight or crooked; whether
heights on either side are accessible or inaccessible; nature of
ground at each extremity; width (frontage of column that can pass
through).

=1007. Ponds and Marshes.= Means of crossing; defensive use that might
be made of them as obstacles against enemy; whether the marshy grounds
are practicable for any or all arms.

=1008. Springs and Rivulets.= Nature of approaches; whether water is
drinkable and abundant.

=1009. Valleys.= Extent and nature; towns, villages, hamlets, streams,
roads and paths therein; obstacles offered by or in the valley, to the
movement of troops.

=1010. Heights.= Whether slopes are easy or steep; whether good
defensive positions are offered; whether plateau is wide or narrow;
whether passages are easy or difficult; whether the ground is broken
or smooth, wooded or clear.

Suggestions for Patrols Employed in Executing Demolition

(Destruction or blocking of bridges, railroads, etc.)

=1011. Patrols never execute any demolition unless specifically
ordered to do so.= Demolition may be of two different characters:
Temporary demolition, such as cutting telegraph wires in but a few
places or merely burning the flooring of bridges, removing a few rails
from a track, etc., and permanent demolition, such as cutting down an
entire telegraph line, completely destroying bridges, blowing in
tunnels, etc. Only temporary demolition will be dealt with in this
book.

=1012. Telegraph Line.= To temporarily disable telegraph lines,
connect up different wires close to the glass insulators, wrap a wire
around all the wires and bury its ends in the groun