▁was ▁incomplete ▁at ▁the ▁out break ▁of ▁war ▁in ▁ 1 9 4 0 . ▁ ▁Description ▁Block ▁ 1 ▁( inf antry ): ▁One ▁machine ▁gun ▁clo che , ▁one ▁gr en ade ▁launch er ▁clo che , ▁two ▁heavy ▁tw in ▁machine ▁gun ▁clo ches ▁and ▁one ▁heavy ▁tw in ▁machine ▁gun ▁em br asure . ▁Block ▁ 2 ▁( observ ation ): ▁One ▁observation ▁clo che . ▁Block ▁ 3 ▁( art illery ): ▁Two ▁ 7 5 mm ▁gun ▁em bras ures . ▁Block ▁ 4 ▁( art illery ): ▁One ▁machine ▁gun ▁clo che , ▁four ▁ 8 1 mm ▁mort ar ▁em bras ures ▁and ▁one ▁additional ▁em br asure . ▁En tr ance ▁block : ▁One ▁machine ▁gun ▁clo che ▁( un comple ted ), ▁two ▁of ▁four ▁machine ▁gun ▁em bras ures ▁completed . ▁Aer ial ▁tram ▁entry : ▁An ▁additional ▁entry ▁served ▁the ▁position ▁by ▁aer ial ▁tram ▁from ▁Pont ▁N ua , ▁not ▁completed . ▁ ▁History ▁During ▁the ▁Italian ▁invasion ▁of ▁France ▁in ▁ 1 9 4 0 , ▁Pas ▁du ▁Roc ▁was ▁the ▁focus ▁of ▁an ▁advance ▁over ▁the ▁Italian ▁border ▁by ▁the ▁Italian ▁Super ga ▁Division . ▁On ▁ 2 1 ▁June ▁the ▁cable ▁of ▁the ▁aer ial ▁tram ▁was ▁cut ▁by ▁the ▁It ali ans . ▁ ▁Pas - du - R oc ▁opened ▁fire ▁with ▁machine ▁guns ▁and ▁mort ars , ▁while ▁the ▁advanced ▁post ▁of ▁Fr é jus ▁directed ▁the ▁fire ▁of ▁the ▁ouv rage . ▁On