I have now found out that this award was mentioned in the London Gazette Supplements - on 14/01/1916 he was mentioned as being awarded the DCM and on 11/03/1916 it gives a detailed mention

"9769 Private E J Swanborough, 2nd Battalion, Border Regiment.

For conspicuous gallantry and devotion to duty during a surprise night attack by the enemy. He did fine work in rallying men who were retiring by his calm and brave example. On another occasion he volunteered and successfully carried back a message over some three hundred yards of open ground, and at once returned to his company."

Location United Kingdom

Thanks for this information Briony. Sounds like he deserved the DCM.
Regards,
Brian

Location UK