The French Resistance was an underground movement opposing the German occupation of France during World War II. In a holoprogram set in the French village of Sainte Claire in September 1944, several characters, including Brigitte, Katrine, Mademoiselle de Neuf and two more (played by Tuvok and Neelix) were members of the local Resistance cell.
They used the Le Coeur de Lion as a basis to monitor German troop movements and relay information to the Allies via radio. The cell received messages from Allied High Command via messages encrypted in British radio transmissions. When US troops attacked the city, the Resistance was supposed to disable German communications and help the Americans free Sainte Claire.