Each step up in rank is referred to as a promotion. It brought greater pay and greater responsibility.
Private: the ordinary soldier. He may be appointed to Lance-Corporal.
Corporal: typically the senior non-commissioned rank in charge of a Section in an infantry battalion. He may be appointed to Lance-Sergeant.
Sergeant: typically the senior non-commissioned rank in charge of a Platoon in an infantry battalion.
The title of the rank of Corporal and Sergeant is sometimes seen modified by the specialist trade of the soldier, such as Corporal-Wheeler or Sergeant-Cook.
Colour-Sergeant: the rank from which a man may typically be appointed to Company Sergeant Major or Company Quartermaster Sergeant.
Warrant Officer Class II: a new rank introduced by Army Order 70 of 1915, becoming that rank from which a man may typically be appointed to Company Sergeant Major or Regimental Quartermaster Sergeant. (The Colour-Sergeant could no longer be appointed as a Company Sergeant Major).
Warrant Officer Class I: the rank from which a man may typically be appointed to Regimental Sergeant Major .
The soldier could progress no higher than Warrant Officer Class I unless he was commissioned as an officer. The officers’ ranks, which applied to all arms, were
Lieutenant (which with Second Lieutenant was often referred to as a subaltern)
Colonel (a rank used mainly for honorary rather than operational purposes)
Visitors, do please note that army regulations changed from time to time and in particular affected the higher non-commissioned ranks. The listings above give the basics, but many points of fine detail need to be considered when analysing a man’s rank and responsibilities.