Sullivan Ballou was a Union soldier during the American Civil War, known for his heartfelt letter written to his wife, Sarah, shortly before he was killed in battle. He served in the 2nd Rhode Island Volunteer Infantry and fought in several key battles, including the First Battle of Bull Run. His letter, dated July 14, 1861, expressed his deep love for her and his commitment to the Union cause. The letter became famous for its emotional depth and eloquence, highlighting the personal sacrifices made by soldiers. It was later published in the Ken Burns documentary series, The Civil War, bringing wider attention to Ballou's story and the human cost of the conflict.