From Details magazine:

“A” and “B” Batteries, 1st Regiment, Royal Canadian Horse Artillery envelope

The formation of “A” and “B” Batteries as garrison artillery and schools of gunnery in Kingston and Quebec City in 1871 marked a watershed in Canadian military history. The first full-time or regular elements of the post-Confederation Canadian army, they continue to serve proudly as sub-units of 1st Regiment, Royal Canadian Horse Artillery – part of the Royal Regiment of Canadian Artillery.