French U-boat base locations
The allies landed in Normany in early June 1944. Brest was captured by the Allies on 21 Sept 1944 after a month-long battle. The town of Lorient was reached by the US forces on 7 Aug, 1944 but was not attacked in force and held out until May 8, 1945, same can be said of the Saint Nazaire and La Pallice / La Rochelle bases. Bordeaux was captured by the allies on 25 August, 1944.