<P> A raid would begin with an intense artillery bombardment designed to drive off or kill the front - trench garrison and cut the barbed wire . Then the bombardment would shift to form a `` box barrage '' , or cordon , around a section of the front line to prevent a counter-attack intercepting the raid . However , the bombardment also had the effect of notifying the enemy of the location of the planned attack , thus allowing reinforcements to be called in from wider sectors . </P>
<P> A raid would begin with an intense artillery bombardment designed to drive off or kill the front - trench garrison and cut the barbed wire . Then the bombardment would shift to form a `` box barrage '' , or cordon , around a section of the front line to prevent a counter-attack intercepting the raid . However , the bombardment also had the effect of notifying the enemy of the location of the planned attack , thus allowing reinforcements to be called in from wider sectors . </P>
world war 1 attacks often began with a of cannon fire
world war 1 attacks often began with a of cannon fire
bombardment
bombardment