High Quality Content by WIKIPEDIA articles! Matthias W. Day (August 8, 1853 – September 12, 1927) was a career American army officer who received the Medal of Honor, the United States` highest military decoration, for his actions during the Indian Wars in the latter half of the 19th century. Day was a longtime officer with the African-American 9th Cavalry Regiment, seeing action during the Apache Wars against the Apache leaders Victorio and Geronimo.