 In the operations east of there in June and July, his brigade was exceptionally active in the form of minor operations and patrolling that became known as the peaceful penetration.In August, the 1st Division moved south to the Somme sector to participate in the Battle of Amiens and later the attack on the Hindenburg Line.Through his "careful preliminary preparations and sound tactical knowledge", Mackay contributed to the successes of his brigade and was once more mentioned in despatches.