Generate a correct and concise answer for the question based on the words in the context.

Context : General Sir Charles Fergusson, 7th Baronet GCB, GCMG, DSO, MVO (17 January 1865 -- 20 February 1951) was a British Army officer and the third Governor-General of New Zealand.
Question : What military branch did Sir Charles Fergusson, 7th Baronet serve?
British Army