In 1914 he joined
The Queen's Own Rifles of Canada, a Toronto militia regiment, as an officer reaching the rank of Captain when he enlisted with the
166th Battalion (Queen's Own Rifles of Canada), CEF on April 8, 1916. His father served as Chairman of the
Imperial Munitions Board during the
First World War for which he was created 1st Baronet Flavelle. On January 22, 1917 Flavelle married Muriel I. McEachron (b. about 1895) daughter of W. N. McEachron and Isabel F Jackson McEachron. They had at least one son, Sir (Joseph) David Ellsworth Flavelle, 3rd Baronet (1921–1985). The
baronetcy became extinct on David's death. On the death of his father, Ellsworth became the second baronet and became "Sir Ellsworth Flavelle Bart." An accomplished photographer, Ellsworth Flavelle's images illustrated
Katherine Hale's
This is Ontario and then his own
Photography : a craft and creed. A
fonds of over 12,000 of his photographs is in the
Archives of Ontario. ==References==