▁sector ▁allocated ▁to ▁the ▁Canadian ▁Corps ▁at ▁V im y ▁R idge . ▁Further ▁British ▁mines ▁in ▁the ▁area ▁were ▁v eto ed ▁following ▁the ▁blow ing ▁by ▁the ▁Germ ans ▁on ▁ 2 3 ▁March ▁ 1 9 1 7 ▁of ▁nine ▁cr aters ▁along ▁no ▁man ' s ▁land ▁as ▁it ▁was ▁probable ▁that ▁the ▁Germ ans ▁were ▁aim ing ▁to ▁restrict ▁an ▁Al lied ▁attack ▁to ▁predict able ▁points . ▁The ▁three ▁mines ▁already ▁laid ▁by ▁ 1 7 2 nd ▁T unn elling ▁Company ▁were ▁also ▁dropped ▁from ▁the ▁British ▁plans . ▁They ▁were ▁left ▁in ▁place ▁after ▁the ▁assault ▁and ▁were ▁only ▁removed ▁in ▁the ▁ 1 9 9 0 s . ▁Another ▁mine , ▁prepared ▁by ▁ 1 7 6 th ▁T unn elling ▁Company ▁against ▁the ▁German ▁strong point ▁known ▁as ▁the ▁P im ple , ▁was ▁not ▁completed ▁in ▁time ▁for ▁the ▁attack . ▁The ▁gallery ▁had ▁been ▁pushed ▁sil ently ▁through ▁the ▁cl ay , ▁avoid ing ▁the ▁sand y ▁and ▁ch alk y ▁layers ▁of ▁the ▁V im y ▁R idge , ▁but ▁by ▁ 9 ▁April ▁ 1 9 1 7 ▁was ▁still ▁ ▁short ▁of ▁its ▁target . ▁In ▁the ▁end , ▁two ▁mines ▁were ▁blow n ▁before ▁the ▁attack , ▁while ▁three ▁mines ▁and ▁two ▁W omb at ▁charges ▁were ▁fired ▁to ▁support ▁the ▁attack , ▁including ▁those ▁forming ▁a ▁northern ▁fl ank . ▁ ▁Other ▁units ▁active ▁around ▁V im y ▁were ▁ 1 7 5 th , ▁