Sub-Lieutenant Thomas Humphrey Cobb was killed in action aboard the Battle Cruiser H.M.S. Invincible at the Battle of Jutland on 31.5.1916. A Cadet Captain at Osborne and a Chief Cadet Captain at Dartmouth, where he received a Dirk of Honour, young Cobb had joined the ships' company of Invincible shortly before her demise in that epic engagement:

'It was now the turn of the 3rd Battle Cruiser Squadron to engage this redoubtable foe. Led by Invincible, the three ships closed to within 9000 yards, hitting with such force that two of von Hipper's ships were compelled to haul out of the line. The range, however, brought the British under fire of some of Scheer's Battleships, particularly Konig, and Invincible received a number of salvos in quick succession and sank with the loss of 59 Officers and 961 Ratings, including five civilians. The drowned included Rear-Admiral Hood and Flag Captain A.L. Cay ... Invincible was the last of the Battle Cruisers to be sunk on that fatal afternoon'.