Welcome to Canada MorayNovice. You have picked one of the colder snowier winters for your first year here.
Mazeas 20-50 was a catalogue approach with a bit of historical background for the lineages. However in cases it is incomplete or in error. See the
Mazeas 1920-1950 Corrections for some of the corrections.
The Ontario Mounted Rifles perpetuated the 4 CMRR of the CEF. However, they were a short lived unit under that name. Originally, pre-1914, they were the 9th Mississauga Horse, and then redesignated the Ontario Mounted Rifles in 1920, and again the designation was changed in 1924 to The Mississauga Horse. The Mississauga Horse were amalgamated with the Governor General's Horse Guards in 1936. A bit confusing, and not well explained in Mazeas.