▁the ▁initial ▁estimate , ▁making ▁R impl as ▁the ▁second ▁most ▁expensive ▁position ▁( after ▁Monte ▁Gros so ) ▁in ▁the ▁Al pine ▁Line . ▁D iff icult ies ▁with ▁the ▁fri able ▁nature ▁of ▁the ▁rock ▁required ▁that ▁some ▁rock ▁faces ▁be ▁con cret ed ▁or ▁covered ▁with ▁m ason ry ▁to ▁stabil ize ▁them . ▁The ▁project ▁went ▁through ▁three ▁major ▁design ▁changes ▁before ▁completion . ▁ ▁The ▁ouv rage ▁was ▁fully ▁equ ipped ▁and ▁oper ational ▁in ▁August ▁ 1 9 3 7 . ▁In ▁ 1 9 4 0 ▁the ▁position ▁was ▁commanded ▁by ▁Captain ▁T ouss aint . ▁ ▁Description ▁Block ▁ 1 ▁( art illery ): ▁one ▁gr en ade ▁launch er ▁clo che , ▁two ▁heavy ▁tw in ▁machine ▁gun ▁em bras ures ▁and ▁one ▁ 8 1 mm ▁mort ar ▁em br asure . ▁Block ▁ 2 ▁( inf antry ): ▁one ▁machine ▁gun ▁em br asure . ▁Block ▁ 3 ▁( inf antry ): ▁one ▁machine ▁gun ▁clo che ▁and ▁one ▁heavy ▁tw in ▁machine ▁gun ▁em br asure . ▁Block ▁ 4 ▁( art illery ): ▁one ▁observation ▁clo che , ▁one ▁heavy ▁tw in ▁machine ▁gun ▁clo che ▁and ▁three ▁ 7 5 mm ▁gun ▁em bras ures , ▁covering ▁the ▁T in ée ▁valley . ▁Block ▁ 5 ▁( art illery ): ▁one ▁observation ▁clo che , ▁one ▁machine ▁gun ▁clo che ▁and ▁three ▁ 7 5 mm ▁gun ▁em bras ures , ▁covering ▁the ▁Val de bl ore ▁valley .