Definition: Generate a correct and concise answer for the question based on the words in the context.
Input: 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.
Question : What military branch did 61st (2nd South Midland) Division belong to?
Output:
British Army