On 31 July 1917 in Westhoek, Belgium, when his command was held up in attack owing to heavy machine-gun and rifle fire, Brigadier-General Coffin went forward and made an inspection of his front posts. Although under the heaviest fire from both machine-guns and rifles and in full view of the enemy, he showed an utter disregard of personal danger, walking quietly from shell-hole to shell-hole, giving advice and cheering his men by his presence. His gallant conduct had the greatest effect on all ranks and it was largely owing to his personal courage and example that the shell-hole line was held.