How did detecting the sound of enemy guns help win WWI?

The FK 16 field artillery piece was employed by the German army in World War One. It can fire 5 18-pound shells per minute, and strike from as far away as 10 kilometers. German artillery killed more Allied troops during World War One than any other weapon. Allied gunners couldn't destroy the German artillery because it was too far behind enemy lines, often hidden by smoke or fog. How do you hit something you can't see?
To find the answer -- an answer that would shorten the war -- the British tasked a 25 year old soldier named Lawrence Bragg, who had recently become the youngest person to ever win the Nobel Prize in physics. Along with some talented engineers, he invented a way to use sound to triangulate on enemy gun positions.
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