Below are the rankings of soldiers in the English Civil War.
Captain (WILLMORE) Moretta refers to Willmore as a corporal which is below his rank. This can be seen as an insult or represent his waning physical and professional state.
This reading describes in detail the duties of each officer.
An educational worksheet describing some of the jobs on the battlefields during the English Civil War. http://www.battlefieldstrust.com/brentfordandturnhamgreen/education/downloads/Soldiers-Worksheet.pdf