Aerial Reconnaissance

I. French and German Superiority

II. Evolution of Photo Technology

A. Stereoscopic Photos

III. Service de Renseignements Aériens

IV. Challenges of Aerial Reconnaissance

V. Austro-Hungarian reconnaissance of Russia

Signals Intelligence on Land

I. French signals security problems

II. Russian signals security problems

Signals Intelligence at Sea

I. The Kaiser’s Fleet Stays Home

II. Anglo-German Encounter near Chile

III. Battle of Heligoland Bight

IV. “Room 40”

A. Henry “Dummy” Oliver

B. Alfred Ewing

V. Australia produces the Handelsverkehrsbuch (HVB)

VI. Russia produces the Signalbuch der Kaiserlichen Marine (SKM)

VII. The Fishermen produce the Verkehrsbuch (VB)

VIII. Dogger Bank

IX. Battle of Jutland

Zimmerman Telegram

I. Alfred von Zimmerman

II. Code 0075

III. The Swedish and American routes

IV. Reginald “Blinker” Hall’s dilemma

V. Agent T’s Mexican adventure

VI. Code 13040

VII. American Outrage