Marie Depage died on 7 May 1915 in the sinking of RMS Lusitania when it was torpedoed by German submarine SM U-20, killing nearly 1,200 passengers and crew.

Depage studied medicine at the Universite Libre de Bruxelles (ULB), and graduated magna cum laude in 1887.

That summer they were on vacation at Folkestone, where Henri found a Scout camp and insisted on taking his mother to see it.

A large tent had been pitched, but everyone slept in the orangerie of the family house of Ernest Solvay à la Hulpe.

Dr. Depage, with his eldest son Pierre, also a Scout and surgeon, founded and took charge of the Belgian Ambulance in the Balkan War (1912-1913).