The London Gazette reports on 28 June 1918:

No. 15883 L./Cl. James Hewitson, R. Lanc. R. (Coniston).
For most conspicuous bravery, initiative and daring in action.
In a daylight attack on a series of crater posts, L./Cpl. Hewitson led his party to their objective with dash and vigour, clearing the enemy from both trench and dug-outs, killing in one dug-out six of the enemy who would not surrender. After capturing the final objective, he observed a hostile machine-gun team coming into action against his men. Working his way round the edge of the crater he attacked the team, killing four and capturing one. Shortly afterwards he engaged a hostile bombing party, which was attacking a Lewis-gun post. He routed the party, killing six of them.
The extraordinary feats of daring performed by his gallant N. C. O. crushed the hostile opposition at this point.