According to William Stevenson's The Life of Vera Atkins, the Greatest Female Secret Agent of World War II (Arcade Publishing, 2006), Atkins' first mission was to get Poland's cryptologists Marian Rejewski, Jerzy Różycki, and Henryk Zygalski out of the country, and she was a member of the British military mission (MM-4), alongside Colin Gubbins, which arrived in Poland posing as civilians, by way of Greece and Romania, six days before the outbreak of the war.