Soon, the gun was seen to be useful in marching fire assaults, notably by the Australian Corps in the July 1918 Battle of Hamel.
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Following the success of the Australian attack at Le Hamel on 4 July, Haig entrusted Rawlinson with planning a larger attack, designed to force the Germans back from the city of Amiens, and also further to damage the German Army's weakening morale.
By December 1917, Lavarack was a Lieutenant Colonel and General Staff Officer, 1st grade in the Australian 4th Division, and took part in battles at Dernancourt, Villers-Bretonneux, Hamel and Amiens, with Lavarack's hand in planning for the Battle of Hamel setting the stage for several subsequent Australian victories.