Her first act of rebellion was to steal a bicycle from a German military administration, and to slice the tires of all of the other bikes and motorcycles so they couldn't pursue her. She found a pocket of the Resistance and joined the fight, using the stolen bike to deliver messages between Resistance groups. She was an extremely fast learner and quickly became an expert at tactics and explosives. She led teams of Resistance fighters to capture German troops, set traps, and sabotage German equipment. As the war dragged on, her deeds escalated to derailing German trains, blocking roads, blowing up bridges and helping to create a German-free path to help the Allied forces retake France from the inside. She was never caught. Segouin was present at the liberation of Chartres on August 23, 1944, and then the liberation of Paris two days later. She was promoted to lieutenant and awarded several medals, including the Croix de Guerre. After the war, she studied medicine and became a pediatric nurse. She is still going strong at 96.