<P> Bunker Hill Day, observed every June 17, is a legal holiday in Suffolk County, Massachusetts (which includes the city of Boston), as well as Somerville in Middlesex County . Prospect Hill, site of colonial fortifications overlooking the Charlestown Neck, is now located in Somerville, which was previously part of Charlestown . State institutions in Massachusetts (such as public institutions of higher education) located in Boston also celebrate the holiday . However, the state's FY2011 budget requires that all state and municipal offices in Suffolk County be open on Bunker Hill Day and Evacuation Day . </P> <P> On June 16 and 17, 1875, the centennial of the battle was celebrated with a military parade and a reception featuring notable speakers, among them General William Tecumseh Sherman and Vice President Henry Wilson . It was attended by dignitaries from across the country . Celebratory events also marked the sesquicentennial (150th anniversary) in 1925 and the bicentennial in 1975 . </P> <P> Over the years the Battle of Bunker Hill has been commemorated on four U.S. Postage stamps . </P>

Who won the battle of bunker hill and why did they win