This teenager rashly joined up at the outbreak of hostilities, fudging his age up by two years to qualify. It’s more than likely that he, and his real age, were known to the recruiters who signed him up. (He wasn’t the only child soldier in that war.)
Burden is the “model” for the memorial statue a later, more soft-hearted British Empire put up in 2001 commemorating 306 British and Commonwealth soldiers shot during the first World War for desertion and cowardice.
* Here’s a book about an Irish battalion that was nearly annihilated in the battle.
Shot at Dawn memorial/Herbert Burden likeness photo (cc) Noisette.