Operation Neptune - Coordination With The French Resistance

Coordination With The French Resistance

The various factions and circuits of the French Resistance were included in the plan for Overlord. Through a London-based headquarters which supposedly embraced all resistance groups, État-major des Forces Françaises de l'Intérieur (EMFFI), the British Special Operations Executive orchestrated a massive campaign of sabotage tasking the various Groups with attacking railway lines, ambushing roads, or destroying telephone exchanges or electrical substations. The Allies developed four plans for the French Resistance to execute on D- Day:

• Plan VERT was a fifteen day operation involving sabotage against the rail system.
• Plan BLEU dealt with destroying electrical facilities.
• Plan TORTUE was a delaying operation aimed at the enemy forces that would potentially reinforce Axis forces at Normandy.
• Plan VIOLET dealt with the cutting of underground cables.

The resistance was alerted to carry out these tasks by means of the messages personnels, transmitted by the BBC in its French service from London. Several hundred of these were regularly transmitted, masking the few of them that were really significant.

Among the stream of apparently meaningless messages broadcast by the BBC at 21:00 CET on 5 June were coded instructions such as Les carottes sont cuites ("The carrots are cooked") and Les dés sont jetés ("The dice have been thrown").

One famous pair of these messages is often mistakenly stated to be a general call to arms by the Resistance. A few days before D-Day, the (slightly misquoted) first line of Verlaine's poem, Chanson d'Automne, was transmitted. "Les sanglots longs des violons de l'automne" (Long sobs of autumn violins) alerted the resistance fighters of the Ventriloquist network in the Orléans region to attack rail targets within the next few days. The second line, "Bercent mon coeur d'une langueur monotone" ("soothe my heart with a monotonous languor"), transmitted late on 5 June, meant that the attack was to be mounted immediately.

Josef Götz, the head of the signals section of the German intelligence service (the SD) in Paris, had discovered the meaning of the second line of Verlaine's poem, and no fewer than fourteen other executive orders they heard late on 5 June. His section rightly interpreted them to mean that an invasion was imminent or underway, and they alerted their superiors and all Army commanders in France. However, they had issued a similar warning a month before, when the Allies had begun invasion preparations and alerted the Resistance, but then stood down because of a forecast of bad weather. The SD having given this false alarm, their genuine alarm was ignored or treated as merely routine. Fifteenth Army HQ passed the information on to its units; Seventh Army ignored it.

In addition to the tasks given to the Resistance as part of the invasion effort, the Special Operations Executive planned to reinforce the Resistance with three-man liaison parties, under Operation Jedburgh. The Jedburgh parties would coordinate and arrange supply drops to the Maquis groups in the German rear areas. Also operating far behind German lines and frequently working closely with the Resistance, although not under SOE, were larger parties from the British, French and Belgian units of the Special Air Service brigade.

A 1968 report from the Counter-insurgency Information Analysis Center details the results of the French Resistance's sabotage efforts: "In the southeast, 52 locomotives were destroyed on 6 June and the railway line cut in more than 500 places. Normandy was isolated as of 7 June. The telephone network in the invasion area was put out of order and beginning June 20, the railway lines of France were rendered inoperable, except in the Rhone Valley where the line Marseilles-Lyon was kept open by the Germans despite heavy engagements with units... Although the German local reserves were able to reach the front area despite resistance action... marked delays were achieved against the movement of strategic reserves. The French claim to have delayed up to 12 divisions for 8 to 15 days"