The influential nurse known for her contributions to medical care during the Crimean War was Florence Nightingale. Regarded as the founder of modern nursing, Nightingale tackled unsanitary conditions in military hospitals, which significantly contributed to high mortality rates. She implemented sanitation reforms and advocated for better hospital design, leading to improved care for wounded soldiers. Nightingale's pioneering efforts not only transformed nursing practices, but also established nursing as a respected profession for women. Her legacy continues through the principles she established, emphasizing hygiene, patient-centered care, and effective hospital management.