approach of the units lead naturally to the
adoption of the formation. 'Lines' only then, when it is absolutely
necessary to deliver an attack from column of route as rapidly as
possible, and hence the time is lacking for a more systematic
formation. Such cases can, for instance, arise in the deployment at
the issue of a defile, or in bringing up troops from Assembly
formation through the intervals of a crowded battle-field, or under
analogous conditions; but even in these cases a foreseeing command
will endeavour to facilitate the execution of the 'Wing Attack' by the
choice of some such formation as the 'double column,' which admits of
deployment to either hand.

Thus we see that our Regulations at least give to the Leader the
possibility of choosing the best and most suitable formations for the
execution of his purpose, but the latter also must be sufficiently
master of his art to know which to select.

Further, it is the duty of the Leader, in the case of mutual encounter
between manoeuvring bodies of the Arm, to choose the momentarily most
favourable form of attack with reference to his own line of approach.
It is not easy to lay down in general terms in what manner this can be
best insured, for the circumstances of the operations themselves and
the nature of the ground are capable of influencing the decision in
too many ways. One can only lay down certain general principles which
may form a basis in the appreciation of each situation as it happens
to arise.

In the first place, one must select one's own base of attack in such a
direction that the following blow will force the enemy to retire in
what will be for him the most disadvantageous direction, and,
conversely, for one's own purposes the best.

But, naturally, in making this choice the tactical advantages or
otherwise of the ground must not be overlooked or left to the enemy,
for the tactical victory is the necessary preliminary to further
results. Further, we should always endeavour to secure the advantage
of the 'outer lines' so as to act concentrically upon the enemy. In
this position, if beaten, his lines of retreat cross one another, and
to avoid this predicament he will be compelled to endeavour to
manoeuvre across our front, always a most dangerous undertaking.

On the other hand, if our attack fails, we have still the advantage of
eccentric retreat, which compels the adversary to divide his forces,
and thus opens to us the opportunity of furth