Origins of Britain’s Modern Intelligence Community

I. Decyphering Branch, 1703-1844

II. Topographical and Statistical Department (T&S)

III. Intelligence Branch (IB)

IV. Naval Intelligence Department (NID)

V. Criminal Investigation Department (CID)

VI. Special Branch

Naissance of Intelligence

I. Boer War

II. Gleichen’s position

III. Edmonds’s position

IV. Reorganization of Intelligence Services

A. Directorate of Military Operations (DMO)

B. Foreign Intelligence Section (MO2)

C. Administration and Special Duties Section (MO3)

D. Topographical Section (MO4)

Intelligence and the War Scares

I. 1900 German Navy Law

II. Anglo-French Entente Cordiale, 1904

III. Anglo-Russian Treaty of Rapprochement, 1907

IV. Thoughts on peacetime training

V. 1907 German Naval building acceleration

VI. Subcommittees of Committee of Imperial Defence (CID)

Secret Service Bureau, 1909

I. home section/Military Intelligence/MI5

II. foreign section/Secret Intelligence Service/SIS/MI6

British Intelligence in WWI

I. MI5’s successes and challenges

A. Arrests of Germans

B. Subversive activities

II. Government Code and Cypher School (GCCS)

A. Bletchley Park

B. Renamed Government Communications Headquarters (GCHQ)

British Intelligence in WWII and beyond

I. Special Operations Executive (SOE)

II. GCHQ’s triumphs

III. Joint Intelligence Bureau (JIB)/Defense Intelligence Staff

IV. UK-US Special Relationship

A. BRUSA agreement on sigint, May 1943

B. UKUSA agreement, 1947