lish ments ▁in ▁Australia <0x0A> </s> ▁The ▁Mort ier ▁de ▁ 7 5 ▁mod èle ▁ 1 9 1 5 ▁Schne ider ▁was ▁a ▁French ▁tren ch ▁mort ar ▁designed ▁and ▁built ▁by ▁Schne ider ▁that ▁saw ▁action ▁with ▁the ▁French ▁and ▁Belg ian ▁Army ▁during ▁the ▁First ▁World ▁War . ▁ ▁History ▁ ▁The ▁majority ▁of ▁military ▁pl ann ers ▁before ▁the ▁First ▁World ▁War ▁were ▁wed ded ▁to ▁the ▁concept ▁of ▁fighting ▁an ▁off ensive ▁war ▁of ▁rapid ▁man eu ver ▁which ▁in ▁a ▁time ▁before ▁mechan ization ▁meant ▁a ▁focus ▁on ▁caval ry ▁and ▁light ▁horse ▁art illery ▁firing ▁sh rap nel ▁shell s ▁at ▁form ations ▁of ▁troops ▁in ▁the ▁open . ▁ ▁However , ▁the ▁the or ists ▁hadn ' t ▁for ese en ▁that ▁tren ches , ▁bar bed ▁wire , ▁and ▁machine ▁guns ▁would ▁rob ▁them ▁of ▁the ▁mob ility ▁and ▁as ▁the ▁Western ▁Front ▁st agn ated ▁into ▁tren ch ▁war fare ▁the ▁light ▁field ▁guns ▁that ▁the ▁combat ants ▁went ▁to ▁war ▁with ▁began ▁to ▁show ▁their ▁limitations ▁when ▁facing ▁an ▁enemy ▁who ▁was ▁now ▁d ug ▁into ▁prepared ▁positions . ▁ ▁The ▁problem ▁facing ▁the ▁combat ants ▁was ▁that ▁their ▁light ▁field ▁guns ▁were ▁designed ▁for ▁direct ▁fire ▁and ▁only ▁had ▁limited ▁angles ▁of ▁elev ation ▁and ▁wer en ' t ▁capable ▁of ▁providing ▁indirect ▁fire ▁or ▁the ▁inter diction ▁fire ▁needed ▁to ▁deal ▁with ▁enemy ▁troops ▁in ▁d ug - in ▁positions . ▁ ▁The ▁simple ▁exped ient ▁was ▁to ▁elev ate