Thanks - fascinating to recall that we had troops in Kiev/Kyiv, acting as representatives of the UK as a global power. He died in Aug 1920, so presumably after his time with Gen Borbovitch's Cav Bde, but how & where did he die? It might have been something more prosaic such as Spanish 'flu.From the Royal Artillery Commemoration Book, pg 342-3:
Major G Sumpter DSO, MC, RFA was a senior liaison officer to the Armies of New Russia (HQ Kieff). There were also LOs to the Russian corps in each army (ie Caucasian, Don and Volunteer as well as New Russia).
"Major G Sumpter, while en route to join his group at Kieff during the retreat in December, 1919 found himself cut off from them, and, joining General Borbovitch's Cavalry Brigade, fought for several weeks with their Lewis gun detachment, gaining great distinction."