London's volunteers for the infantry mainly entered the City of London Regiment (Royal Fusiliers) or the Middlesex
Regiment. A total of 45 battalions were formed under the title of the City of London Regiment during the course of the
war, including four battalions raised from public school students (18th, 19th, 20th and 21st Battalions), three battalions
recruited exclusively from Londoners of Jewish background (38th, 39th and 40th Battalions), and a frontiersmen battalion
composed of African game hunters, polar explorers, sportsmen, and other adventurers (25th Battalion).
To compound the confusion between the regular Royal Fusiliers battalions and the territorial City of London Regiment
battalions, many of these wartime battalions preferred to affect the title Royal Fusiliers rather than City of London
Regiment. To add further confusion to an already difficult subject, the Middlesex Regiment also had battalions which held
the subtitle the City of London Regiment.