Secret history

World War I -- War breaks out -- German spies in Britain -- Invisible messages to Germany -- Black Tom -- British counter-espionage -- Allied spies -- Female spies -- Codes and ciphers -- Code-breakers -- The code talkers -- Secret weapons in battle -- Secret weapons in the air -- Submarine warfare -- Tunnelling under the trenches -- Propaganda and censorship -- The Zimmerman telegram -- The Hindu-German conspiracy -- The end of the war

"This high-interest series, aimed at reluctant readers, looks at secret campaigns behind the major conflicts of the past 100 years. Biographical sidebars focus on heroic or notorious personalities. Highlighted fact features include special operations and their results, resistance movements, propaganda and the history of the time - as is known....and not readily known"--Provided by publisher