▁had ▁deployed ▁five ▁t unn elling ▁companies ▁along ▁the ▁V im y ▁R idge , ▁and ▁ ▁during ▁the ▁first ▁two ▁months ▁of ▁their ▁ten ure ▁in ▁the ▁area , ▁ 7 0 ▁mines ▁were ▁fired , ▁mostly ▁by ▁the ▁Germ ans . ▁Between ▁October ▁ 1 9 1 5 ▁and ▁April ▁ 1 9 1 7 ▁an ▁estimated ▁ 1 5 0 ▁French , ▁British ▁and ▁German ▁charges ▁were ▁fired ▁in ▁this ▁ ▁sector ▁of ▁the ▁Western ▁Front . ▁ ▁In ▁March ▁ 1 9 1 6 , ▁the ▁New ▁Zealand ▁T unn elling ▁Company ▁had ▁taken ▁over ▁this ▁sector ▁of ▁the ▁Western ▁Front ▁between ▁Roc lin court ▁and ▁É cur ie ▁from ▁the ▁French ▁ 7 / 1 ▁compagnie ▁d ' ing én ieurs ▁territ oria ux . ▁On ▁ 2 9 ▁March ▁ 1 9 1 6 , ▁the ▁New ▁Zealand ers ▁ex changed ▁position ▁with ▁the ▁ 1 8 5 th ▁T unn elling ▁Company ▁and ▁moved ▁to ▁Roc lin court - Ch ante cler , ▁a ▁kilomet re ▁south ▁of ▁their ▁old ▁sector . ▁At ▁the ▁same ▁time , ▁the ▁ 1 7 2 nd ▁T unn elling ▁Company ▁was ▁deployed ▁in ▁the ▁Ne uv ille - Saint - V a ast ▁sector ▁along ▁with ▁the ▁ 1 7 6 th ▁and ▁ 1 8 5 th ▁T unn elling ▁Comp an ies . ▁ 1 7 2 nd ▁T unn elling ▁Company ▁was ▁rel ieved ▁in ▁this ▁area ▁by ▁the ▁ 2 nd ▁Australian ▁T unn elling