At her court-martial, she was prosecuted for aiding British and French soldiers, in addition to young Belgian men, to cross the Dutch border and eventually enter Britain. She admitted her guilt when she signed a statement the day before the trial. Cavell declared that the soldiers she had helped escape thanked her in writing when they arrived safely in Britain. This admission confirmed that Cavell had helped the soldiers navigate the Dutch frontier, but it also established that she helped them escape to a country at war with Germany. Her fellow defendants included Prince Reginald's sister, Princess Marie of Croÿ.