During the First World War , he was a doctor in the military ambulance where he realized the vital role of the blood transfusions .
Arnault Tzanck ( 1886 -- 1954 ) was a French physician and a pioneer of blood transfusion .
During the First World War , Arnault Tzanck was a physician in the military ambulance where Arnault Tzanck realized the vital role of the blood transfusions .
Arnault Tzanck ( 1886 -- 1954 ) was a French physician and a pioneer of blood transfusion .