nd ▁Division ▁and ▁the ▁ 2 2 nd ▁Brigade . ▁Due ▁to ▁the ▁calm ▁and ▁warm ▁weather ▁the ▁entire ▁def ensive ▁line ▁was ▁soon ▁eng ulf ed ▁in ▁a ▁cloud ▁of ▁smoke ▁and ▁dust . ▁The ▁bar rage ▁last ed ▁for ▁the ▁entire ▁day ▁and ▁had ▁mixed ▁effects , ▁depending ▁on ▁the ▁ground ▁and ▁strength ▁of ▁the ▁fort ifications ▁it ▁was ▁directed ▁at . ▁This ▁was ▁the ▁case ▁in ▁the ▁sector ▁of ▁the ▁ 3 0 2 nd ▁Division ▁where ▁the ▁Bulgar ian ▁ 2 / 2 nd ▁Infantry ▁Brigade ▁was ▁def ending ▁lines ▁situated ▁in ▁a ▁flat ▁plain ▁and ▁the ▁sh el ters ▁were ▁not ▁enough ▁for ▁all ▁the ▁soldiers . ▁By ▁contrast ▁the ▁bomb ard ment ▁hardly ▁made ▁an ▁impression ▁on ▁the ▁German ▁ 2 0 1 st ▁Infantry ▁Brigade ▁which ▁occupied ▁the ▁important ▁hills ▁ 1 0 2 0 ▁and ▁ 1 0 5 0 . ▁Its ▁inf antry ▁benef ited ▁from ▁the ▁rug ged ▁terrain ▁and ▁the ▁excellent ▁sh el ters , ▁that ▁were ▁in ▁some ▁cases ▁d ug ▁in ▁the ▁solid ▁rock . ▁The ▁Al lied ▁art illery ▁fire ▁in ▁the ▁sector ▁of ▁the ▁Bulgar ian ▁ 3 / 7 ▁Infantry ▁Brigade ▁caused ▁serious ▁damage ▁on ▁part ▁of ▁the ▁bar bed ▁wire ▁and ▁col lapsed ▁several ▁inf antry ▁sh el ters . ▁Von ▁Re uter ' s ▁troops ▁were ▁also ▁exposed ▁to ▁the ▁heavy ▁bomb ard ment ▁and ▁had ▁some ▁of ▁their ▁first - line ▁tren ches ▁and ▁bar bed ▁wire ▁sever ely ▁dam aged . ▁The ▁Al