The massacre of the Newfoundlanders took place over no more than 20 or 30 minutes, in which time some 80% of the regiment are believed to have become casualties - all of the officers and some 645 other ranks. Of the 770 men who jumped-off from the St.John's Road support trench, which ran immediately beside the current Hamel-Auchonvilliers road on the border of the park, only about 110 survived unwounded. This degree of attrition was second only to that of the Green Howards at Fricourt on July 1st.