He received a commission as an officer into the
British Army's
Coldstream Guards regiment during the
Second World War. In August 1944, during the liberation of Europe in the West from
Nazi Germany, Hartington's unit, the 5th Battalion Coldstream Guards, as a part of the
Guards Armoured Division, was engaged in heavy fighting in
France. In early September 1944, it crossed the
River Somme and pushed eastward towards
Brussels, where it was one of the first to liberate the city. Of the townsfolk and villagers who turned out and cheered the
Allies and, in some cases, decorated their tanks, Hartington wrote to his wife of feeling "so unworthy of it all living as I have in reasonable safety and comfort during these years..... I have a permanent lump in my throat and long for you to be here as it is an experience which few can have and which I would love to share with you." On 9 September 1944, Hartington was shot dead at the age of 26 by a
sniper whilst leading a company trying to capture the town of
Heppen in
Belgium from troops of the
German Waffen-SS. He is buried at the
Leopoldsburg War Cemetery. ==Personal life==