This is the line that makes extensive preparations for fighting (or
resisting). It is called the "line of supports" or the "line of
resistance."[2] We have one farther and last line of groups which is
still larger and occupies still greater distances than the two we have
just discussed. This is the safety valve and is called the "reserve," or
the "line of reserves." This is the line that gives a sound factor of
safety. It will only be called upon in cases of emergency and may
therefore generally enjoy a considerable degree of repose. But it and
the line of supports combined must have sufficient strength to delay the
enemy, in case of a general attack, long enough for our main body to
form for battle.
Let us look at the line of outguards for further important
considerations and distinctions. The enemy's movements and operations
should ordinarily be expected where there are for him least
difficulties. Large (dangerous) bodies of troops find trouble in
marshes, thick forests, steep mountainous country. They avoid these
obstacles as much as possible, selecting open country, solid soil,
strong bridges, and good roads.
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