The Italian Royal Navy (Regia Marina) operated one of largest cruiser forces of World War II. As a signatory to the 1922 Washington Naval Treaty, the Regia Marina immediately attempted to reinforce its treaty-limited battleship force by building seven large 10,000-ton heavy cruisers. Italian light cruisers also possessed an interesting design history and were involved in every major fleet engagement in the Mediterranean, as well as several smaller encounters with units of the British Royal Navy.