William H. Johnston (born July 1850), from St. Johnsbury, Vermont, was a drummer boy in Company D of the 3rd Vermont Infantry. His service during the Seven Days Battles in the Peninsula Campaign was exemplary. He was the only drummer in his division to come away with his instrument, during a general rout. His superiors considered this a meritorious feat, when fellow soldiers had thrown away their guns. As a result, he received the Medal of Honor on the recommendation of his division commander, thereby becoming the youngest recipient of the highest decoration at 13 years of age.