After graduating from the Royal Military Academy, Woolwich, Montgomery was commissioned into the Royal Artillery in July 1868.[1][2]
He was Deputy Director-General of the Ordnance from 1897,[3] and was appointed Commander Royal Artillery for Southern District, based in Portsmouth, in November 1902,[4] with the rank of major-general.[5] A year later, he became General Officer Commanding Southern District, also based in Portsmouth.[6] He went on to be General Officer Commanding South Coast Defences in April 1904 and then General Officer Commanding Transvaal District in May 1906 before returning to England in April 1908.[6] In October 1908 he served on an ordnance board.[7]
He retired from the army in September 1910.[8]
He served briefly in the First World War initially as a General Officer Commanding the 22nd Division of Lord Kitchener's Army at Seaford[1] and then as Director of Recruiting in the autumn of 1915.[6]
He came from Greyabbey, Ireland[9] but lived at Pentrepant, in the parish of Selattyn, near Oswestry in Shropshire.[1] He was appointed a Companion of the Order of the Bath (CB) in the June 1902 Coronation Honours list.[10]