Roger Georges Scipion Souchère was born on 21 February 1899 in Courbevoie, Hauts-de-Seine.

[3] Souchère was a member of the Freemasons, but resigned from the "Center des Amis" No.

[4] During World War II (1939–45) Souchère joined the French Resistance, and was one of the co-founders of the Organisation civile et militaire (OCM), a resistance group led by Jacques Arthuys and lieutenant-colonel Alfred Touny.

Arthuys led the movement and was assisted by Souchère as Chief of Staff, Jean Mayer in charge of the first and third Bureaus, Touny for the 2nd Bureau, and Maxime Blocq-Mascart for Civil matters.

[1] He was arrested, and was deported from Compiègne on 16 April 1943, reaching Mauthausen-Gusen concentration camp in Germany two days later.