U-Boot Stützpunkt Marseille

Marseille was the Germans' main port in the Mediterranean. The city was occupied from November 1942 to August 1944 and during this period was a part of the German South wall. It became heavily fortified with several gun batteries and air defenses. In early 1943 the Germans blew up part of the district known as Vieux Port because they thought it was here that the French Resistance had its stronghold. At the same time they started construction of a large U-boat bunker in the port. The bunker, codenamed Martha, was intended to become the Germans' main submarine base in the Mediterranean and was designed to accommodate up to 20 U-boats.

Just offshore from the port lies the Iles du Frioul archipelago, where they built two gun batteries, one of six 155 mm. guns and the other of four 155 mm. guns, all mounted in pillboxes, plus a fire control post. An additional battery of four 240 mm. guns was also planned. The islands already possessed several French naval gun batteries.

On 27th May 1944 Marseille was bombed by the Americans and on August 14th the Allied invasion force came ashore southeast of the city. The advance against Marseille went quickly and on August 24th, the area was bombarded by the American cruiser USS Nevada. Over the next three days American bombers dropped over 50 tonnes of bombs on the positions on Iles du Frioul.

The Germans in Marseille capitulated on 28 August 1944 to French forces and the Iles du Frioul surrendered the day after. The U-boat bunker was never completed and today only the garage portion of the bunker has been preserved.