Mata Hari also became a celebrated courtesan, and by the outbreak of World War I, her catalog of lovers included high-ranking military officers and political figures from both France and Germany. The circumstances of her alleged spying activities during the war were and remain unclear: it was said that, while in the Netherlands in 1916, she was offered cash by a German consul to report back information obtained on her next visit to France. It appears that British intelligence discovered details of this arrangement and passed them on to their counterparts in France. In any case, Mata Hari was arrested in Paris in February 1917.
Under interrogation by French military intelligence, Mata Hari herself admitted that she had passed outdated information to a German intelligence officer, yet she claimed that she had also been paid to act as a French spy in Belgium (then occupied by the Germans), though she had not informed the French of her prior dealings with the German consul. She was apparently acting as a double agent, though the Germans had apparently written her off as an ineffective agent whose activities had produced little intelligence of value.
Mata Hari was tried in a military court and sentenced, on July 25, 1917, to execution by firing squad. As the Times of London reported on October 15, 1917, the day of her execution, “She was in the habit of meeting notorious German spy-masters outside French territory, and she was proved to have communicated important information to them, in return for which she had received several large sums of money since May 1916.” Her trial was riddled with bias and circumstantial evidence, however, and many believed the French authorities, as well as the press, trumped her up as “the greatest woman spy of the century” as a distraction for the huge losses the French army was suffering on the Western Front. Viewed by many as a victim due to her career as a dancer and courtesan and the French need to find a scapegoat, Mata Hari remains one of the most glamorous figures to come out of the shadowy world of espionage, and the archetype of the female spy.
