Quick Facts
In full:
Ralph Henry Van Deman
Born:
September 3, 1865, Delaware, Ohio, U.S.
Died:
1952, San Diego, California (aged 86)

Ralph Van Deman (born September 3, 1865, Delaware, Ohio, U.S.—died 1952, San Diego, California) was an American intelligence officer, called “the father of American military intelligence.”

Van Deman followed an eclectic educational course before settling on a military career: he took a degree from Harvard, studied law for a year, and then took a medical degree (1893). He served briefly as an army surgeon and then attended the Infantry and Cavalry School at Fort Leavenworth, Kansas. In 1897 he was assigned to the Military Intelligence Division (MID). In 1901, then a captain, he organized the Philippine MID. It was in the Philippines that Van Deman developed his expertise in organizing documents and records. He was given his first covert mission, the mapping of lines of communication around Beijing in 1906. A year later he was appointed chief of the map section of the MID in Washington, D.C. General Franklin Bell, then chief of staff, who harboured a grudge against intelligence officers in general and Van Deman in particular, forced the virtual disbanding of MID by merging it with the War College.

In 1915 Van Deman returned to Washington from a second tour in the Philippines and found intelligence operations in chaos. In response he created an unofficial group of associates to collect and coordinate intelligence. With the entry of the United States into World War I in 1917, he attempted to reorganize military intelligence. The chief of staff, General Hugh Scott, found the idea of spying so distasteful that he ordered Van Deman to cease all efforts to organize a service. By adroit political maneuvering, however, Van Deman was able to gain sympathetic attention in higher government circles and soon found himself in charge of the reconstituted MID. As organized by Van Deman, military intelligence included the forerunners of the Defense Mapping Service, the Counter-Intelligence Corps (CIC), the Intelligence Command, the Industrial Security organization, the National Security Agency, and the U.S. Army Intelligence Center and School. Among those employed by him were the cryptographer Herbert O. Yardley; John Foster Dulles, later U.S. secretary of state; and Allen Dulles, later director of the Central Intelligence Agency (CIA). Later in the war Van Deman served in France, and in 1919 he was the senior American intelligence officer and chief of counterintelligence for the Paris Peace Commission. He retired as a major general in 1929.

Van Deman continued his intelligence work in private life. He created a massive set of files on private citizens whose political affiliations he believed to be potentially subversive. In this enterprise he enjoyed the unofficial cooperation of local police departments, military intelligence organizations, and the Federal Bureau of Investigation (FBI). This loose network survived in many instances after regular intelligence services were severely limited in the 1930s. In 1941 Van Deman was appointed intelligence adviser to the War Department. His work during World War II earned him the Legion of Merit.

After Van Deman’s death his files were taken over by a nonprofit research organization called the San Diego Research Library, which made them available not only to government agencies but also to private political groups and candidates, a practice that led to abuses. The files were routinely consulted in the granting of security clearances until 1971, when the practice was halted by executive order.

This article was most recently revised and updated by Encyclopaedia Britannica.
Table of Contents
References & Edit History Quick Facts & Related Topics
Quick Facts
Also called:
Second World War
Date:
September 3, 1939 - September 2, 1945
Top Questions

What was the cause of World War II?

What countries fought in World War II?

Who were the leaders during World War II?

What were the turning points of World War II?

How did World War II end?

How many people died during World War II?

World War II, conflict that involved virtually every part of the world during the years 1939–45. The principal belligerents were the Axis powersGermany, Italy, and Japan—and the Allies—France, Great Britain, the United States, the Soviet Union, and, to a lesser extent, China. The war was in many respects a continuation, after an uneasy 20-year hiatus, of the disputes left unsettled by World War I. The 40,000,000–50,000,000 deaths incurred in World War II make it the bloodiest conflict, as well as the largest war, in history.

Along with World War I, World War II was one of the great watersheds of 20th-century geopolitical history. It resulted in the extension of the Soviet Union’s power to nations of eastern Europe, enabled a communist movement to eventually achieve power in China, and marked the decisive shift of power in the world away from the states of western Europe and toward the United States and the Soviet Union.

(Read Sir John Keegan’s Britannica entry on the Normandy Invasion.)

Axis initiative and Allied reaction

The outbreak of war

By the early part of 1939 the German dictator Adolf Hitler had become determined to invade and occupy Poland. Poland, for its part, had guarantees of French and British military support should it be attacked by Germany. Hitler intended to invade Poland anyway, but first he had to neutralize the possibility that the Soviet Union would resist the invasion of its western neighbour. Secret negotiations led on August 23–24 to the signing of the German-Soviet Nonaggression Pact in Moscow. In a secret protocol of this pact, the Germans and the Soviets agreed that Poland should be divided between them, with the western third of the country going to Germany and the eastern two-thirds being taken over by the U.S.S.R.

Having achieved this cynical agreement, the other provisions of which stupefied Europe even without divulgence of the secret protocol, Hitler thought that Germany could attack Poland with no danger of Soviet or British intervention and gave orders for the invasion to start on August 26. News of the signing, on August 25, of a formal treaty of mutual assistance between Great Britain and Poland (to supersede a previous though temporary agreement) caused him to postpone the start of hostilities for a few days. He was still determined, however, to ignore the diplomatic efforts of the western powers to restrain him. Finally, at 12:40 pm on August 31, 1939, Hitler ordered hostilities against Poland to start at 4:45 the next morning. The invasion began as ordered. In response, Great Britain and France declared war on Germany on September 3, at 11:00 am and at 5:00 pm, respectively. World War II had begun.

Germany invades Poland, September 1, 1939, using 45 German divisions and aerial attack. By September 20, only Warsaw held out, but final surrender came on September 29.
Britannica Quiz
Pop Quiz: 17 Things to Know About World War II