LONDON — After she died earlier this month, a frail 89-year-old alone in a flat in the British seaside town of Torquay, Eileen Nearne, her body undiscovered for several days, was listed by local officials as a candidate for what is known in Britain as a council burial, or what in the past was called a pauper’s grave.

But after the police looked through her possessions, including a Croix de Guerre medal awarded to her by the French government after World War II, the obscurity Ms. Nearne had cultivated for decades began to slip away.

Known to her neighbors as an insistently private woman who loved cats and revealed almost nothing about her past, she has emerged as a heroine in the tortured story of Nazi-occupied France, one of the secret agents who helped prepare the French resistance for the D-Day landings in June 1944.

On Tuesday, the anonymity that Ms. Nearne had cherished in life was denied her in death. A funeral service in Torquay featured a military bugler and piper and an array of uniformed mourners. A red cushion atop her coffin bore her wartime medals. Eulogies celebrated her as one of 39 British women who were parachuted into France as secret agents by the Special Operations Executive, a wartime agency known informally as “Churchill’s secret army,” which recruited more than 14,000 agents to conduct espionage and sabotage behind enemy lines.