If the stopped first line can maintain itself at the limit of its
progression, it is generally not in an open field. Its line will serve
as a parallel of departure for the units of the second line. These units
at first try to reach the line of shelter where they will be formed.
Their assaulting formation results from the march formation, and the
waves will be composed of half companies.
The first wave rushes out of cover at the double to at least half the
distance and opens fire; fire being opened, the second wave rushes _in
line_ and carries along the first.
Here the firing cannot be prevented, as artillery support, now faulty,
has to be replaced by rifle fire, to which is joined the fire of machine
guns and light cannon, which alone can make possible so fearful an
assault.