NOTES:
- List of Battles and Secondary Actions comes from British Nomenclature for the Battle of the Somme: Refer Battle of the Somme for transcribed list
- Where pages already exist and are called "Battles" rather than engagements, actions or "capture of", the original page name was moved when the article was completed
- Full Secondary Action list added as red-links, most written by 1 November 2014
- Revised headings according to Record of Battles and Engagements, James 1924; two red links to go
- Simplified list consistent with other boxes