Boston began the oldest mounted police unit in the country in 1870, with evidence of an unofficial mounted policing force as far back as 1630. At the height of the unit’s presence more than 100 horses were housed in city stables. Now just 10 mounts call the police department’s Brandegee Estate home. Sergeant George Survillo (left) leads the morning training at the Boston Mounted Police riding facility while riding Bailey. Boston Police Officer Joe Fawkes rides Clancy.