Anna Lehusen entered the Clara Abbey as a member of the order of Saint Clare of Assisi.
During this period, Sweden and Denmark, formally united through the Kalmar Union, was involved in various warfare which eventually led to the Swedish War of Liberation.
During the siege, the St. Clare's Priory was used as an escape channel by people who wished to join the Swedes outside the city, both merchants and courtiers.
During the day, she signaled by hanging a white cloth out of the window and, during the night, a lamp to the part of the convent facing the city, as a sign to the Danes that there were refugees in the building.
[1] In June 1523, Stockholm was retaken by the Swedes and made capital of the independent Kingdom of Sweden.