Question: What soldier was promoted to Corporal at the age of 10 ?
About the article "World War I", section "Serbian campaign".

Candidate passages:
Leaving his lucrative employment as a clerk with the Australian Mutual Provident Society, he enlisted in the First AIF on 17 August 1914 (he was the eighth man to enlist at Essendon on day one); he was immediate given the rank of Lance-Corporal, and was promoted to Corporal on 6 April 1915. 
A soldier can be promoted from private ("soldato") to corporal rank ("caporale") after 3 months of service. 
United States.
United States Army.
In the U.S. Army corporal is preceded by the first three forms of private and the rank of specialist.
A corporal rank shares the same pay grade (E-4) as a specialist.
Unlike a specialist, however, a corporal is a non-commissioned officer and may direct the activities of other soldiers.
A soldier may be promoted to corporal directly from the rank of private first class or laterally promoted from specialist.
The typical criterion for promotion to corporal is that the junior enlisted soldier must be serving in a leadership position that would typically be occupied by an NCO such as a sergeant or higher.
Normally these promotions are given to specialists who work in an NCO position but who are prevented promotion to sergeant (E-5) due to not having sufficient promotion points.
This promotion is done at the discretion of the unit commander; many specialists serve in NCO positions.
For a time, it was not uncommon to find paralegal corporals assigned to the legal assistance branch of a post's staff judge advocate's office, despite often having little or no actual leadership duties.
Army Regulation 27-55 "Notarial Services" conferred (under provisions of 10 U.S.C.
§§ 936, 1044a) authority to act as a notary and consul of the United States upon JAG Corps NCOs.
Notarisation of powers of attorney and other documents is a "bread-and-butter" task in such offices, which necessitated the presence of either NCOs or state notaries.
AR 27-55 was later amended to confer the authority on such paralegal specialists who are so designated by their respective staff judge advocate.
It is common for a corporal to lead a fireteam; however, if a soldier is promoted to corporal and there are too many soldiers of that rank, the new corporal will stay in his current position. 
Born in Glasgow on 30 September 1828, Knox joined the British Army at the age of 14.
He was under-age, but was unusually tall, he was promoted to corporal before reaching the age of 18. 
William Brown (1759–1808) was a soldier for the Continental Army during the American Revolutionary War.
He was born in Stamford and enlisted in the 5th Connecticut Regiment as a corporal on 23 May 1775, and re-enlisted as a private on 9 April 1777, for the duration of the war in the 8th Connecticut Regiment.
He was promoted to corporal on 8 May 1779, and to sergeant on 1 August 1780, transferring with the consolidation of units to the 5th Connecticut Regiment on 1 January 1781, and to the 2nd Connecticut Regiment on 1 January 1783.
He was awarded the Badge of Military Merit, one of only three people to be awarded the medal that later became the Purple Heart.
No record of his citation has been uncovered, but it is believed that he participated in the assault on Redoubt No.
10 during the siege of Yorktown.
After the war he moved west to a newly developed river town called Cincinnati, Ohio.
He lived out his days there, his original tombstone was lost to time; possibly stolen or destroyed.
On 24 July 2004, at a cemetery across the street from what is known as Lunken Airport, a new tombstone was laid out in remembrance to Sgt.
William Brown.