'Operations near Solesmes on 23rd November 1918. For conspicuous gallantry and devotion to duty. 2/Lieutenant Mayn, who is Scout Officer to the Battalion, rendered valuable service to his Commanding Officer. For awhile the leading Companies were held up and he sent forward to reconnoitre. For two hours, under very heavy machine gun and shell fire, he remained in a shell hole on the hill side sending back messages which enabled reinforcements to be sent to the right spot and the advance to be continued. That night at 11.30 a further advance was made and he had a Company forward for a mile over unknown ground, greatly assisting the Company Commander in establishing his position. Throughout these operations, he showed marked ability, great powers of endurance and an absolute disregard for danger.'
Source: London Gazette
Date: 3 June 1919