The sources contradict. Some say that the Landfront at the coast starts at the tobruk in Le Croquet. Others state that the infantery CP at La Brière has that honor. We stick to the designation of the strongpoints and declare all places with a Ha-number inside the Festung and also in the Landfront. The strongpoint at La Brière is Stpgr Nord, Ha K 001 and has only Vf bunkers and brickstone buildings. So we start at La Bruyère with a nice 677.
We think this tobruk at "Le Croquet" was part of the defence of the nearby airfield.