Louis Mountbatten, 1st Earl Mountbatten of Burma - Wikipedia

https://en.m.wikipedia.org/wiki/Louis_Mountbatten,_1st_Earl_Mountbatten_of_Burma
On August 27, 1979, The Earl Mountbatten of Burma, cousin of Queen Elizabeth II and last Viceroy of India, was killed along with three companions, two of them children by the IRA when his boat was blown up near Sligo, Ireland. He served admirably as the Supreme Allied Commander of the Southeast Asia Theatre and as the mentor of Prince Charles. From the article:

His duties in this role included inventing new technical aids to assist with opposed landings.[1] Noteworthy technical achievements of Mountbatten and his staff include the construction of "PLUTO", an underwater oil pipeline from the English coast to Normandy, an artificial harbour constructed of concrete caissons and sunken ships, and the development of amphibious tank-landing ships.[1] Another project that Mountbatten proposed to Churchill was Project Habakkuk. It was to be a massive and impregnable 600-metre aircraft carrier made from reinforced ice ("Pykrete"): Habakkuk was never carried out due to its enormous cost.[1]

As commander of Combined Operations, Mountbatten and his staff planned the highly successful Bruneval raid, which gained important information and also captured part of a German Würzburg radar installation and one of the machine's technicians on 27 February 1942. It was Mountbatten who recognized that surprise and speed were essential to ensure the radar was captured, and saw that an airborne assault was the only viable method.[34] He was in large part responsible for the planning and organisation of The Raid at St. Nazaire in mid-1942, an operation which put out of action one of the most heavily defended docks in Nazi-occupied France until well after war's end, the ramifications of which contributed to allied supremacy in the Battle of the Atlantic. After these two successes came the Dieppe Raid of 19 August 1942. He was central in the planning and promotion of the raid on the port of Dieppe. The raid was a marked failure, with casualties of almost 60%, the great majority of them Canadians.[27] Following the Dieppe raid Mountbatten became a controversial figure in Canada, with the Royal Canadian Legion distancing itself from him during his visits there during his later career.[35] His relations with Canadian veterans, who blamed him for the losses, "remained frosty" after the war.[36]

Mountbatten claimed that the lessons learned from the Dieppe Raid were necessary for planning the Normandy invasion on D-Day nearly two years later. However, military historians such as former Royal Marine Julian Thompson have written that these lessons should not have needed a debacle such as Dieppe to be recognised.[37] Nevertheless, as a direct result of the failings of the Dieppe raid, the British made several innovations, most notably Hobart's Funnies – specialized armoured vehicles which, in the course of the Normandy Landings, undoubtedly saved many lives on those three beachheads upon which Commonwealth soldiers were landing (Gold Beach, Juno Beach, and Sword Beach).[38]

In August 1943, Churchill appointed Mountbatten the Supreme Allied Commander South East Asia Command (SEAC) with promotion to acting full admiral.[27] His less practical ideas were sidelined by an experienced planning staff led by Lieutenant-Colonel James Allason, though some, such as a proposal to launch an amphibious assault near Rangoon, got as far as Churchill before being quashed.[39]

British interpreter Hugh Lunghi recounted an embarrassing episode which occurred during the Potsdam Conference, when Mountbatten, desiring to receive an invitation to visit the Soviet Union, repeatedly attempted to impress Josef Stalin with his former connections to the Russian imperial family. The attempt fell predictably flat, with Stalin dryly inquiring whether "it was some time ago that he had been there". Says Lunghi, "The meeting was embarrassing because Stalin was so unimpressed. He offered no invitation. Mountbatten left with his tail between his legs."[40]

During his time as Supreme Allied Commander of the Southeast Asia Theatre, his command oversaw the recapture of Burma from the Japanese by General William Slim.[41] A personal high point was the receipt of the Japanese surrender in Singapore when British troops returned to the island to receive the formal surrender of Japanese forces in the region led by General Itagaki Seishiro on 12 September 1945, codenamed Operation Tiderace.[42] South East Asia Command was disbanded in May 1946 and Mountbatten returned home with the substantive rank of rear-admiral.[43] That year, he was made a Knight of the Garter and created Viscount Mountbatten of Burma, of Romsey in the County of Southampton as a victory title for war service.[44]

Following the war, Mountbatten was known to have largely shunned the Japanese for the rest of his life out of respect for his men killed during the war, and as per his will, Japan was not invited to send diplomatic representatives to his funeral in 1979, though he did meet Emperor Hirohito during a state visit to Britain in 1971, reportedly at the urging of the Queen."