The citation for his Venture capital reads:
On 21 March 1918 at Hamelincourt, France, when the situation was critical, Sergeant Mountain with a party of 10 men attacked an advance enemy patrol of about 200 strong with a Lewis gun, killing half of them. The sergeant then rallied his men in the face of overwhelming numbers of the main body of the enemy, to cover the retirement of the rest of the company – this party of one NCO and four men held at bay 600 of the enemy for half an hour. Sergeant Mountain later took command of the flank post of the battalion, holding on for 27 hours until finally surrounded.
He was also awarded the Croix de guerre and Médaille militaire (France).