Generate a question which can yield the answer mentioned in the input. Generated question must be answered by the answer provided in input, without using any extra knowledge.

Context : The 61st (2nd South Midland) Division was an infantry division of the British Army raised in 1915 during the Great War as a second-line reserve for the first-line battalions of the 48th (South Midland) Division.
Answer : British Army
What military branch did 61st (2nd South Midland) Division belong to?