This Celtic cross was erected at Queen’s Rd and Cathedral St (now in a traffic island) by the sergeants and warrant officers of the second battalion of the Royal Newfoundland Regiment. The original monument marks WW1. Brass plaques were added to mark later wars. You can see a newer peacekeeping monument is in the background.
From The Fighting Newfoundlander, Gerald WL Nicholson (1964) ch XV:
The earliest monument to be erected in St. John’s, other than tablets in the churches and schools, was the Sergeants’ Memorial, a fine Celtic cross of Scottish granite on the base of Newfoundland granite, standing on Queens Road at the foot of Garrison Hill. … The Memorial was unveiled by Sir Alexander Harris on July 1, 1921, and for the next two years it was the centre of the Commemoration Day ceremonies.
Great War 100 Reads 