If the exit cannot be made by all fractions at one time, the elements of the second line should avoid coming out at the same point as those of the first line.
TO CROSS A CREST.
139.—Cross altogether and rapidly.
Let the line of sections assemble at top of crest, crouching carefully below the sky line. Then, upon concerted signal, all should leap quickly across and down the descending slope, making as extended bounds as possible.
This makes crossing fairly safe as even the infantry will have to modify both its elevation and angle of sight for every new position of this quickly moving target.
PRECAUTIONS AGAINST CAVALRY.
140.—Cavalry Patrols.
During the whole "approach" watch should be kept for possible cavalry patrols. The elements acting as advance guard and flank guards or as combat patrols have as part of their special mission to keep the cavalry away from the main body.