The practice of rubbing frostbite with snow gained popularity during the Napoleonic Wars but is not advocated by modern medicine. Rapid re-warming through soaking hands or feet in warm water is recommended by the Mayo Clinic, as rubbing can further damage tissues. In 1956, Merryman disproved the snow rubbing treatment and introduced rapid re-warming, leading to a more effective treatment for frostbite. This highlights the evolution of medical practices and the importance of evidence-based interventions. The controversy lies in historical methods versus current guidelines, showcasing the continuous advancements in medical knowledge and treatment options.
https://outdoors.stackexchange.com/questions/15801/why-did-people-rub-snow-on-frozen-feet