for information of higher commanders.

11. Lateral defense of boyaux must not be overlooked.

12. Wide turning movements are not possible. Enveloping movements are
possible only on local attacks against small portions of the hostile
line after it has been pierced. All main attacks are confined to
purely frontal attacks.

13. The most important obstacle is barbed wire entanglements.

14. Communication (liaison) between and co-ordination and co-operation
of, the different elements of a command is of the utmost importance.

15. Artillery co-operates more closely than ever with infantry. Its
reconnaissance officers accompany infantry lines in order to obtain
information. _There is a certain number of artillery observers
attached to each battalion of infantry_.

The general method of attack is to smother the defense with a torrent
of explosive shells, kept up incessantly for one or more days, and
shatter the defense so they will offer but slight resistance to the
infantry; then rush forward with the infantry and seize the positions
while the enemy is demoralized, and consolidate them before
reenforcements can be brought up.

The artillery bombardment is necessary to prepare the way for the
infantry advance. It has for its objects:
(1) To destroy the hostile artillery, wire entanglements and
infantry trenches.