The Great War, it turns out, featured among other new technologies microphones deployed along the front lines to try to identify artillery units.
These weren’t recorded to audio directly; rather they were recorded as visual charts, much like a seismograph.
A couple of years ago a British firm, Coda to Coda, collaborated with the Imperial War Museum to reconstruct the end of the war based on surviving charts. It’s a powerful piece, and you really need to listen to the end. Just one minute long.