Tunnelling began in March 1915 by 171st Tunnelling Coy Royal Engineers. The Canadian Engineers relieved the R.Es in April 1916. The 1st Australians arrived at the end of 1916.



Tunnelling began in March 1915 by 171st Tunnelling Coy Royal Engineers. The Canadian Engineers relieved the R.Es in April 1916. The 1st Australians arrived at the end of 1916.