In 1921 a reorganisation of the New Zealand Military Forces saw the former Canterbury, and Otago Artillery Brigades amalgamated into the 3rd Artillery Brigade of the territorial New Zealand Artillery. The Regiment consisted of 9, 10, 11 and 12 batteries. 9, 11 and 12 Batteries were formed by retitling the former B, C and E batteries, which dated back to the 1860s, respectively, while 10 Battery was a new unit. 11 battery was disbanded on 1 June 1931 and in 1937 the brigade absorbed the 14th medium and 16th light batteries and was retitled as the 3rd Artillery Brigade group.
