Pamela Pigeon

New Zealand-British cryptographer and the first female commander in Britain’s Government Communications Headquarters during World War II.

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Edith Cavell

English war-nurse, head of a nurses’ training school in Brussels, where she attended German as well as Allied soldiers during the European War. In August 1915, she was accused by the German military authorities of Belgium of assisting prisoners to escape, and in October was condemned to be shot by a firing squad of German soldiers.

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Olive Hazlett

Olive Clio Hazlett was an American mathematician who worked in algebra. Between 1914 and 1930 she published fourteen papers that were presented at meetings of the American Mathematical Society. She did outstanding work for the Cryptanalysis Committee during World War II.

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Joan Clarke

Joan Clarke was one of the English mathematicians recruited to work on wartime German codes with Alan Turing at Bletchley Park.

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Lucy Ann Walker

During the US Civil War, runaway slave couple Dabney and Lucy Ann Walker provided Union General Joseph Hooker with valuable intelligence.

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Policarpa Salavarrieta

Policarpa Salavarrieta was a Neogranadine seamstress who spied for the Revolutionary Forces during the Spanish Reconquista of the Viceroyalty of New Granada (modern-day Colombia, Ecuador, Panama and Venezuela). Considered a heroine of Colombian independence, she was captured by Spanish Royalists and executed for high treason. The anniversary of her death is commemorated with the Day of the Colombian Woman.

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