Teenage soldiers in World War I
Around 250.000 boys under age of 18 served in the British Army during World War I.
If you wonder why teenagers were allowed to participate in a war like this, the answer is because recruitment officers were paid two shillings and sixpence for each new army recruit, and would often ignore any concerns they had about age.
Also many people at the start of 20th century didn’t have birth certificates, so it was easy to lie about the age.
Most of them went by free will, and others by society pressure.