Battery Alexander featured eight 12″ breech-loading mortars like these on Fisher’s Island, New York (photo circa 1915). Each mortar could pivot on its housing and swivel on its base. Photo: Adelard T. LeGere, Post Photographer for Fort H.G. Wright, Matt Edwards Collection, Coast Defense Study Group, Public Domain, https://commons.wikimedia.org/w/index.php?curid=18193943