It is an approved maxim in war, never to do what the enemy wishes you
to do, for this reason alone, that he desires it. A field of battle,
therefore, which he has previously studied and reconnoitred, should
be avoided, and double care should be taken where he has had time to
fortify and entrench. One consequence deducible from this principle is,
never to attack a position in front which you can gain by turning.