In which country did British Army officers first develop the game of snooker in the 1870s?

In the 1870s, billiards was popular among British Army officers in Jubbulpore, and several variations of the game were devised there. In 1875, army officer Neville Chamberlain (not the later Prime Minister), stationed in India, devised a set of rules combining two pool games: pyramids, played with 15 red balls in a triangle, and black pool, which involved potting designated balls. A similar game also originated that year at the Officers' Mess of the 11th Devonshire Regiment. The first set of snooker rules was finalised in 1882 by Chamberlain, who helped devise and popularise the game at Stone House in Ootacamund, on a table built by Burroughes & Watts and sent to India by sea. His role came to light 63 years after the fact, in a letter to The Field magazine published on 19 March 1938. By the early 20th century, snooker was predominantly played in the United Kingdom, and the World Snooker Championship was first held in 1926–27, won by Joe Davis. A set consists of 22 balls: 15 reds, six colours and the white cue ball. Potting every red with a black, then all six colours, yields the maximum break of 147.