Directorate of Military Intelligence (United Kingdom)

The Directorate of Military Intelligence (DMI) was a department of the British War Office.

Over its lifetime the Directorate underwent a number of organisational changes, absorbing and shedding sections over time.

History
The first instance of an organisation which would later become the DMI was the Department of Topography & Statistics, formed by Major Thomas Best Jervis, late of the Bombay Engineer Corps, in 1854 in the early stages of the Crimean War.

When the War Office was subsumed into the Ministry of Defence (MoD) in 1964, the DMI was absorbed into the Defence Intelligence Staff.

Sections
During World War I, British secret services were divided into numbered sections named Military Intelligence, department number x, abbreviated to MIx, such as MI1 for information management. The branch, department, section, and sub-section numbers varied through the life of the department, however examples include:

Two MI section-names remain in common use, MI5 and MI6, in most part due to their use in spy fiction and the news media.

"MI5" is used as the short form name of the Security Service, is included in the agency's logo and web address. MI6 is included as an alias on the Secret Intelligence Service website, though the official abbreviation, SIS, is predominant.

While the monikers remain, the agencies are now responsible to different departments of state, MI5 to the Home Office, and MI6 the Foreign Office.

Directors of Military Intelligence
Directors of Military Intelligence have been: Director of Military Intelligence  Director General of Mobilisation and Military Intelligence Director of Military Operations Director of Military Intelligence Director of Military Operations and Intelligence Director of Military Intelligence
 * 1886–1891 Henry Brackenbury
 * 1891–1896 Edward Francis Chapman
 * 1896–1901 John Charles Ardagh
 * 1901–1904 William Nicholson
 * 1904–1906 James Grierson
 * 1906–1910 Spencer Ewart
 * 1910–1914 Henry Wilson
 * 1914–1915 Charles Callwell
 * 1915–1916 Charles Callwell
 * 1916–1918 George Mark Watson Macdonogh
 * 1918–1922 William Thwaites
 * 1922–1923 William Thwaites
 * 1923–1926 John Burnett-Stuart
 * 1926–1931 Ronald Charles
 * 1931–1934 William Henry Bartholomew
 * 1934–1936 John Greer Dill
 * 1936–1938 Robert Hadden Haining
 * 1938–1939 Henry Royds Pownall
 * 1939–1940 Frederick Beaumont-Nesbitt
 * 1940–1944 Francis Henry Norman Davidson
 * 1944–1945 John Alexander Sinclair
 * 1945–1946 Freddie de Guingand
 * 1946–1948 Gerald Templer
 * 1948–1949 Douglas Packard
 * 1949–1953 Arthur Shortt
 * 1953–1956 Valentine Boucher
 * 1956–1959 Cedric Rhys Price
 * 1959–1962 Richard Eyre Lloyd
 * 1962–1965 Marshall St John Oswald