Logistics played a key role in the success of Operation Dragoon, the Allied invasion of Southern France during World War II that commenced with the US Seventh Army landings on the French Riviera on 15 August 1944. On 12 September, the Seventh Army made contact with Allied forces that had landed in Normandy earlier that year as part of Operation Overlord. The supporting logistical organizations continued to operate separately, with the Southern Line of Communications supporting the Seventh Army drawing its supplies from the North African Theater of Operations until it merged with the Communications Zone of the European Theater of Operations on 20 November.
The primary objective of the campaign was to capture the ports of Marseille and Toulon, preceding a drive northward up the Rhone valley to connect with Allied forces from Normandy. Both ports were captured, but they had been badly damaged by German demolitions and Allied bombing, so considerable effort was required to bring them into service. The unexpectedly rapid Allied advance was the principal cause of logistical problems, although a theater-wide shortage of service units and an unanticipated dearth of French civilian labor also contributed.
Operations in southern France gave French troops a chance to assist in the liberation of their country, but the French units also created an additional logistical burden because they lacked the service troops required to provide their support. These logistical constraints prevented the operational commanders from taking full advantage of the opportunities offered by the German retreat. To facilitate the advance, engineers repaired bridges, rehabilitated railways, and laid pipelines.
The logistics plan gave priority to ammunition during combat loading, in the expectation that the Germans would stubbornly resist the invasion. When this proved to not be the case, the ammunition in the assault and follow-up convoys had to be moved out of the way to reach other materiel, which slowed unloading. Efforts to alter the shipping schedules met with mixed success. The operations of the Seventh Army were hampered by these logistical constraints. Many soldiers had to subsist on K-rations for extended periods, because fresh meat and produce were unavailable in the first month of the campaign due to a lack of refrigerator cars and trucks.
Southern France did not produce sufficient food to feed itself, and food supplies for the civilian population had to be given additional priority. As the weather deteriorated in September, the advance slowed, and there was a rush to equip the soldiers with winter clothing. The October battles demonstrated that the German capacity for hard fighting had not been overestimated, and critical shortages of ammunition occurred.
Background
A direct Allied invasion of southern France was considered at the Trident Conference in May 1943, but it was regarded as too risky and was passed over in favor of an Allied invasion of Italy. Nonetheless, the American Joint Chiefs of Staff continued to consider the operation, as resources had accumulated in the North African Theater of Operations (NATOUSA), including a large French Army that was being raised and equipped in North Africa. Not all of these resources were required for operations in the Mediterranean, but shipping was scarce, and the resources needed for Operation Overlord, the Allied invasion of Normandy, were often more easily moved from the United States to the United Kingdom than from North Africa to the United Kingdom.
Plans for Overlord called for a concurrent diversionary effort against southern France, which was codenamed Operation Anvil. Anvil's objectives were the seizure of the ports of Marseille and Toulon, followed by a drive northward up the Rhone valley to link up with the Overlord forces. At the Tehran Conference in November 1943, the Premier of the Soviet Union, Joseph Stalin, came out in favor of operations in southern France. The Combined Chiefs of Staff therefore adopted a resolution to "launch Overlord during May, in conjunction with a supporting operation against the south of France on the largest scale that is permitted by the landing craft available at that time."