The conditions of 1917 permitted us to concentrate a very large mass of artillery for offensive action and our infantry became accustomed to look for lavish artillery support in their operations.
Today circumstances have altered and it is no longer practicable to concentrate artillery resources on certain portions of our front and to leave the rest almost bare.
Infantry therefore must be trained to fight and to manoeuvre under cover of artillery fire on the principles laid down in F.S.R. Part I, rather than to rely on the invariable support of a dense barrage.
The forward movement of our own infantry or the arrest of the enemy's advance can only be assured by the effective and combined fire of artillery, machine-guns, rifles and trench mortars.