The Réseau AGIR (English: Network for ACTION) was a World War II espionage group founded by French wartime resister Michel Hollard that provided decisive human intelligence on V-1 flying bomb facilities in the North of France.

[4] Thanks to Hollard's reports and information from his agents of the Réseau AGIR, the V1 launch sites located across North-Eastern Normandy to the Strait of Dover, were systematically bombed during Operation Crossbow.

[6][7][8] Early 1941, Hollard became the concessionaire for the Seine department for the "Maison Gazogène Autobloc", headquartered in Dijon, that, among other things, produced wood gas generators for automobiles and supplied its clients with charcoal.

[9] In 1941, Hollard traveled to the French Free Zone and crossed the Swiss border for the first time to offer his services as a spy to the British embassy in Bern.

Mostly traveling by train, he primarily established contacts with railway employees who, due to their work, had knowledge of the occupying forces' activities or knew how to obtain it.

[23][24] Michel Hollard and 4 other AGIR agents (including Henri Dujarier and Jules Mailly) were arrested during a cafe meeting on the Rue du Faubourg-Saint-Denis.

[25][26] Hollard was tortured and subjected to waterboarding five times by the Gestapo and the Milice, and imprisoned first at Fresnes prison and in June 1944 as a forced laborer at the main Neuengamme concentration camp.

[39] AGIR prepared a more detailed report in October about Bois Carré, which is located 1.4 km east of Yvrench,[40] that claimed it had "a concrete platform with the center axis pointing directly to London".

[47] With the help of René Bourdon, the station manager there, and his assistant Pierre Carteron, Hollard was able to penetrate a shed of the local sugar factory in which the transported V-1 were stored, hidden under a tarpaulin and made precise dimensional sketches of the devices.

[49][50] Thanks to Hollard's reports and information from his agents of the Réseau AGIR, the V1 launch sites located in the North of France, across North-Eastern Normandy to the Strait of Dover, were systematically bombed by the Royal Air Force between mid-December 1943 and March-end 1944, as a part of the Operation Crossbow.

In his book Crusade in Europe General Eisenhower wrote that had the Germans been able to develop their weapons six months earlier and to target Britain's south coast, Operation Overlord would have been near impossible, or not at all possible.

[55] Decorated with the Légion d'honneur, the French Croix de Guerre and the British King's Medal for Courage, Joseph Brocard was the last surviving AGIR agent and died in 2009.