Russian gunboat Opyt (1861) explained

The gunboat Opyt (: experience) was the first ironclad warship commissioned by the Imperial Russian Navy. It was built by Carr and MacPherson at the Baltic shipyard in Saint Petersburg.[1] English and Russian wrought iron plates 1200 x 1000 mm in size protected the front part of the gunboat.

References

Notes and References

  1. http://www.bz.ru/ru/history-hist_ship.html Boats and ships built at the Baltic Factory (1856-2006)