From Wikipedia:

Edith Louisa Cavell (December 4, 1865–October 12, 1915) was a British World War I nurse and humanitarian. She is celebrated for helping hundreds of Allied soldiers escape from German-occupied Belgium. Her subsequent execution received significant sympathetic press coverage worldwide. “Patriotism is not enough…” Her strong religious belief propelled Cavell to help all those who needed help - whether a member of the German forces or the Allied forces. “I can’t stop while there are lives to be saved”.
Nurse Cavell helped hundreds of soldiers from the Allied forces to escape from occupied Belgium to the neutral Netherlands, in violation of military law. She was arrested on August 3, 1915 and charged with harbouring Allied soldiers, not for espionage. She was jailed for 10 weeks, with the last two weeks being in solitary confinement and court-martialled by the Germans for this offence.
She made no defence, admitting her actions, and was ordered to be executed by firing squad at 2am on October 12. A degree of controversy attends the execution itself. According to some accounts, on the way to the Wall she became faint, stumbled and fell. While she was unconscious on the ground, the German commanding officer took a revolver and shot Cavell dead . However, eyewitness accounts by "one Pasteur Le Seur," who attended Cavell in her final hours, assert that the firing squad functioned normally, with eight soldiers firing at Cavell while eight others executed a Belgian civilian, a Philippe Baucq.
Image source
www.edithcavell.org.uk
Legends and Traditions of the Great War