Source: October 1915 Medical Officer’s War Diary. Accidentally shot self on October 1, 1915. War Diary has name spelled at Rushmere.
“George married Florence Mabel HARRISON on 26 Dec 1921 in St. Marks’ Church, Cheetham Hill, Manchester, Lancashire. (Florence Mabel HARRISON was born on 26 Mar 1897 in Kettlestone, Norfolk and died on 21 Mar 1968.)”
Ironically, George William Rushmer died on the same day as his wife, according to the family tree.