[1] When World War I broke out, Thuliez was working as a teacher in Saint-Waast-la Vallée.

She became part of an underground network that helped allied soldiers who were trapped behind enemy lines to get out of Belgium and into Holland.

She worked closely with Edith Cavell, Philippe Baucq and Princess Marie of Croÿ.

[1] Thuliez published a book in 1933[5] on her experiences in prison, titled Condemned to Death which won a Montyon Prize in 1935.

[6] Thuliez worked with Princess Marie de Croÿ again during World War II.