During an advance on 12 October the first point of resistance encountered was two pillboxes east of Augustus Wood. Jeffries organised a bombing party and rushed one emplacement, capturing two machine-guns and twenty-five prisoners. He then led his company forward under heavy artillery and machine-gun fire to the objective. As the 34th prepared for the next stage of the advance it was harassed by machine-gun fire. Jeffries gathered another party of twelve men, and the group successfully captured two guns and thirty more prisoners. Jeffries was killed in the attack.