As the commanding officer of the Deuxième Bureau’s aerial section before the war, Ronin created in 1941 a clandestine intelligence service in the German occupied zone.

This skirmish, which preceded the First Battle of the Aisne, would become famous in the French army[4] for its symbolic dimension (with medieval chivalry facing modern artillery and aviation).

In 1934, André Serot had recruited an officer of the General Staff of the Luftwaffe, who had been approached by Paul Stehlin and agreed to sell him the detailed plans of the German air rearmament program.

[6] Georges Ronin met Wilfred Dunderdale (head of MI6 in Paris) and Frederick Winterbotham, his British counterpart[7] in the Royal Air Force.

[11] Radio communications with England were entrusted to Paul Badré, who ran an SR Air station from his home in Bellerive, near Vichy.

Georges Groussard, a member of La Cagoule, met Winston Churchill in London at the request of General Huntziger (Minister of War) and Dr. Ménétrel (personal physician and advisor to Pétain).

On July 16, he was arrested along with his deputy Jean Bezy, who was warned in time and managed to empty their office of compromising papers before the search.

Limoges (commanded by Michel Bouvard) provided information about the strength and positions of the Luftwaffe in occupied territory after the Battle of Britain.

The Marseille station, which focused on Italy, was led by André Serot until he joined Paul Paillole (head of counter-espionage) in the spring of 1941.

After Operation Torch, at the end of 1942, Lacat warned the Royal Air Force that a convoy of 27 German boats was transporting a motorized division to reinforce General Rommel's Afrika Korps in Libya.

[16] On October 19, 1942, alerted by General Revers (Chief of the Defence Staff), Paul Badré narrowly escaped an operation set up by the Abwehr and the Gestapo to identify clandestine transmitters in the Free Zone.

During the night of November 9th to 10th, just hours before the German invasion of the Free Zone, Ronin, Bezy, Bouvard, and Badré took off for Biskra aboard two Dewoitine D.338 provided by General d'Harcourt.

In December 1942, at the request of the OSS and MI6, Ronin sent the secret mission Pearl Harbor to plan the Liberation of Corsica by coordinating with the local Resistance.

[20] When he returned to Alger on January 3, 1943, he chose Paul Badré to lead this new London branch, with the mission of resuming radio broadcasts with René Gervais and overseeing the parachuting of agents into France (Robert Masson was among the volunteers).

Georges Ronin defended the strictly military function of his organization and did not accept the political authority of General de Gaulle.

Processed by the SR Air in Algiers, the intelligence was delivered to General de Gaulle on June 3, three days before Operation Overlord.