The Soldiers and Sailors Monument on Boston Common at Boston, in the U.S. Commonwealth of Massachusetts, was erected in memory of Massachusetts soldiers and sailors who died in the American Civil War. Designed by Martin Milmore, construction began in 1874 and the monument was dedicated on September 17, 1877. Union Generals George B. McClellan and Joseph Hooker were among the estimated 25,000 people attending the dedication on Boston Common.