The 13th General Session of the OIE was held from May 30 to June 5, 1939 at 12 rue de Prony after rebuilding work had been completed. Due to the Second World War, the following General Session did not take place until 1946, from 2 to 5 October. Following their entry into Paris in June 1940, the German occupying forces temporarily closed and sealed the OIE headquarters. The efforts of the President, Gotlieb Flückiger, elected in 1939, resulted in its re-opening.