"The Royal Navy in the Home Waters, 1914-1918" Royal Visitors to the Naval Exhibition. Princess Mary, Prince Henry and Prince George were amongst the visitors to the Naval Exhibition at the Grosvenor Galleries in New Bond Street; they are here seen with Commodore Sir Douglas Brownrigg, Royal Navy, looking at a model of Zeebrugge Harbour (after the attack on St. George's Day, 1918). On the table is seen a piece of Zeebrugge Mole.