(e) Destroy the machine guns as soon as they reveal their positions.
(a) Destruction of the Wire Entanglement.
The 75 produces sufficient breaches in the wire entanglements for the infantry to get through; in order to accomplish this, each piece remains laid on the same point of the entanglement. But the infantry should not expect the complete and continuous destruction of the entanglement: that would require too many projectiles.
(b) Neutralization or Destruction of the Defenders of the Trenches.
The Germans, whenever they can, dig very deep and well protected shelters, in the interior of which they crowd themselves. The 75 has no effect on these shelters, and the infantry of the attack, who are delighted to see the parapets, the sand bags, planks, posts, etc., fly into the air as if pulverized by the ripping detonations, are stupefied on finding themselves greeted by a heavy fire as soon as they start out of their trenches. In consequence of this, the infantry is convinced that whenever the enemy has been able to construct deep shelters, an assault is certain massacre, in spite of the prodigious expenditure of 75’s, unless other and more powerful means of destruction have been employed.
The aerial torpedo, on the contrary, seems to produce terrifying effects on the defenders of the trenches; it has also considerable destructive effect. This power is not always sufficient to break in the shelter caverns, but it completely knocks to pieces the firing trenches, produces cave-ins, blocks the openings of the shelters, and thus walls in the occupants. By its formidable explosion, the extraordinary effects of its blast, and the concussion that it induces in the ground, it annihilates all energy in the defenders, who at every instant think their last minute has come.
In the sector of attack of my company on the 9th of May, a portion of the trenches in front of the 3d and 4th Sections was severely pounded by the fire of the 75 and especially by the aerial torpedoes, while the remainder of the trenches in front of the 1st and 2d Sections suffered only from the preparation by the 75. The difference was remarkable. While the 1st and 2d Sections, hardly out of their parallel, saw the enemy rise up and melted away under his suddenly opened rifle fire, and especially under that of a machine gun, the 4th Section reached the German trench, crossed it without hindrance, and continued on its way. As for the 3d Section, it had been received by only a few shots and had crossed the first trench in one rush, when it received some shots in the back. Returning to the rear, the men found several dozen Germans crouching in the deep shelters, absolutely all in and crying for mercy. The cannonade had ceased, and in spite of the violent fusillade cracking outside announcing an attack, they had not budged. Only a few had the courage to shoot in the back from an opening the French soldiers who passed close by.
Conversations with numerous infantry officers have definitely convinced me that the heaviest bombardment by 75’s alone is ineffective against trenches organized during a long period. The heavy artillery has too much dispersion, while the aerial torpedo, besides its considerable destructive and demoralizing effects, is very accurate.
Thus the preparation on the zone of the first trenches may be made largely by means of aerial torpedoes. But it is necessary that the torpedo guns be placed close together in a continuous line (at least one to every 100 metres of trenches) and that each one have its zone clearly defined.
At Arras, these guns were not very numerous, and their preparation was consequently only partial; in trying to pound several lines of trenches at the same time, large spaces remained outside the effects of their action, while certain corners were entirely demolished.