Clara Barton served as an independent battlefield nurse, supply organizer, and humanitarian during the American Civil War, earning the nickname “Angel of the Battlefield” for her willingness to work under fire when few civilians, and almost no women, were permitted anywhere near the front lines. Her role evolved over the course of the war, from handing out supplies to soldiers camped in Washington, D.C., to nursing wounded men at some of the bloodiest battles in American history, to leading a massive effort to identify missing and dead soldiers after the fighting ended.
First Days of the War
Barton was already living in Washington, D.C., and working as a clerk in the U.S. Patent Office when the war broke out in April 1861. Within days, soldiers of the 6th Massachusetts Infantry arrived in the capital and were quartered inside the Capitol building itself. Barton visited them, bringing whatever supplies she could gather on her own. That experience became the seed of something much larger. She began collecting food, clothing, and medical supplies from donors and distributing them directly to soldiers and surgeons in the camps, forts, and hospitals spreading across the city.
What made Barton unusual was that she operated independently. She wasn’t part of the U.S. Sanitary Commission or any established relief organization. She built her own informal supply network, soliciting donations, stockpiling materials, and personally hauling them to wherever they were needed most. When supplies ran low after a campaign, she returned to Washington to restock before heading back out.
Getting Permission to Reach the Front
Early in the war, women were not allowed in military hospitals or on battlefields. Barton spent months pushing against that barrier. She eventually secured official permission from Surgeon General William A. Hammond to visit battlefields and even cross enemy lines. That authorization transformed her from a behind-the-scenes supply organizer into a frontline presence. Over the course of the war, she brought aid and supplies to the wounded at sixteen different battlefields.
Nursing Under Fire
Barton was present at some of the war’s most devastating engagements: Cedar Mountain, Second Manassas, Antietam, and Fredericksburg, among others. She didn’t observe from a safe distance. She worked in the chaos of active combat, tending wounds and distributing supplies while bullets were still flying.
Her arrival at Cedar Mountain in August 1862 is what gave her the famous nickname. She appeared at a field hospital around midnight with a wagon loaded with supplies. The overwhelmed surgeon on duty later compared her to an angel, and the name stuck.
At the Battle of Antietam on September 17, 1862, the single bloodiest day of the entire war, Barton was carrying a wounded soldier off the field when a bullet passed between her body and her right arm, tearing through her sleeve and striking the man in the chest, killing him. She later wrote: “There was no more to be done for him and I left him to his rest. I have never mended that hole in my sleeve. I wonder if a soldier ever does mend a bullet hole in his coat.”
In December 1862, she traveled to Falmouth, Virginia, anticipating the carnage that would come with the Battle of Fredericksburg. She worked at a Union hospital set up inside the Lacy House, tending to a crush of wounded men in conditions that were primitive even by Civil War standards. She kept a pocket diary during those days, recording deaths and injuries in real time.
Barton’s battlefield routine followed the army’s movements. She worked in temporary field hospitals, stayed as long as she was needed, then moved on to the next engagement. She continued this pattern through later campaigns, including the siege of Charleston and the Wilderness campaign in 1864.
Identifying the Missing and the Dead
When the fighting ended in 1865, Barton turned her attention to a crisis that was enormous in scale but largely invisible: tens of thousands of Union soldiers were simply unaccounted for. Families across the North had no idea whether their sons, husbands, and brothers were alive, imprisoned, or buried in unmarked graves.
Barton contacted Secretary of War Edwin M. Stanton and asked to accompany a U.S. Army expedition to the site of the notorious Andersonville prison in Georgia, where conditions had killed thousands of Union prisoners of war. During July and August of 1865, she and a former prisoner named Dorence Atwater worked through the letters she had received from desperate families, cross-referencing names against the Andersonville death register and captured hospital records. While laborers erected headboards over the graves, Barton wrote dozens of letters to families, informing them that their loved ones had died there. At the end of the expedition, she was given the honor of raising the American flag for the first time over the newly established Andersonville National Cemetery.
President Lincoln himself supported Barton’s broader mission to find missing soldiers. With the help of political allies she had cultivated during the war, Lincoln prepared a public letter: “Miss Clara Barton has kindly offered to search for the missing prisoners of war. Please address her . . . giving her the name, regiment, and company of any missing prisoner.” That presidential endorsement launched a multiyear effort that extended well beyond Andersonville.
The Missing Soldiers Office
After returning from Georgia, Barton established the Missing Soldiers Office in Washington, D.C., in 1865. The office became a clearinghouse where families could write in with the names of missing soldiers, and Barton’s staff would search military records, prison logs, and hospital documents to try to determine what had happened to them. By the time the office closed in 1867, Barton and her team had identified more than 22,000 missing soldiers. Nearly 13,000 of those were men who had died at Andersonville.
The scale of that work is worth pausing on. This was a single civilian, operating with a small staff and no government budget, systematically piecing together the fates of thousands of people using paper records and handwritten letters. Nothing like it existed at the federal level. The Missing Soldiers Office essentially filled a gap that the government had neither the infrastructure nor the political will to address on its own.
Barton’s Civil War experience shaped everything she did afterward, most notably her founding of the American Red Cross in 1881. But during the war itself, her contribution was something more personal and more immediate: she was one of very few people willing to stand in the gap between a massive military machine and the individual human beings caught inside it, whether they were bleeding on a battlefield or missing without a trace.