Casualty of the Great War, and Military Inventor, Frank was a Wing Commander in the Royal Navy.He was part of the storming party on the Mole, the British Royal Navy's famous attempt to neutralize the key Belgian port of Bruges-Zeebrugge.The Zeebrugge Raid involved an armada of British sailors and marines led by the old cruiser, HMS Vindictive, which attacked the Mole in order to negate the serious threat to Allied shipping that was being posed by the port being used by the German Navy as a base for their U-boats and light shipping.Not content to watch the action from an observation ship, he was keen to discover the secret of the German system of sound-ranging and begged permission to go ashore.He was educated at Dulwich College where, notably, he blew up a stove in his form room! In 1901, he joined the family fireworks business and eventually became a director,the position he held until the outbreak of the First World War.He was originally commissioned in the Royal Artillery but within a month, on 31 December 1914, was transferred to the Royal Naval Air Service as a Lieutenant in the Royal Naval Volunteer Reserve.By the time the Royal Naval Air Service merged with the Royal Flying Corps to form the Royal Air Force on 1 April 1918, he had risen to the rank of Wing Commander and had been awarded the Order of the British Empire [O.B.E.] "for services to king and country." He was a member of the Admiralty Board of Inventions and Research and founded, organized and commanded the Royal Navy Experimental Station at Stratford.He invented The Brock anti-Zeppelin Bullet,(or Brock Incendiary Bullet) - the first German airship to be shot down was destroyed by his invention.He also invented the Brock Colour Filter,the Dover Flare [used in anti-submarine warfare] and he also devised, developed and superintended the use of the Smoke Screen, or "artificial fog" as he preferred to call it, which was employed in the attack on Zeebrugge.Henry Major Tomlinson wrote of him " A first-rate pilot and excellent shot, [Wing]Commander Brock was a typical English sportsman and his subsequent death during the operations, for whose success he had been so largely responsible, was a loss of the gravest description to both the Navy and the empire." He was 34 and the son of Arthur Brock of Haredon Sutton, Surrey of the famous C.T. Brock & Co., fireworks manufacturers.He left a widow,Gladys Grosvenor Brock and two daughters, Anne and Francesca.