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Let's go on with some quotes as I promised. Posted images are just illustrations, no other purpose.
Ardant du Picq became one of the first to document the common tendency of soldiers to fire harmlessly into the air simply for the sake of firing. Du Picq made one of the first thorough investigations into the nature of combat with a questionnaire distributed to French officers in the 1860s. One officer's response to du Picq stated quite frankly that "a good many soldiers fired into the air at long distances," while another observed that "a certain number of our soldiers fired almost in the air, without aiming, seeming to want to stun themselves, to become drunk on rifle fire during this gripping crisis."
Lieutenant George Roupell encountered this same phenomenon while commanding a British platoon in World War I. He stated that the only way he could stop his men from firing into the air was to draw his sword and walk down the trench, "beating the men on the backside and, as I got their attention, telling them to fire low.
The easiest way of pretending to fight or posturing is to fire toward the enemy but just a little bit high.