Battle of Bullecourt. In this attack, Gellibrand had his headquarters well forward and his planning was meticulous and detailed. Nonetheless, the attack was very nearly a disaster, and only decisive and forceful leadership from Gellibrand retrieved the situation. For this battle he was awarded a bar to his DSO, made a Companion of the Order of the Bath, and mentioned in despatches. From 25 May to 5 June 1917, he was again acting commander of the 2nd Division. He did not get along well with Smyth, Brigadier General Robert Smith of the 5th Infantry Brigade, or Colonel A. H. Bridges, the division's chief of staff. According to Bean, "misunderstandings between himself and the divisional staff had caused Gellibrand to ask for relief from the brigade command. Birdwood was eager to compose the difficulty, but Gellibrand would not take the opportunity offered for explanation. Gellibrand's request was therefore granted." Gellibrand was sent to the AIF Depots in the United Kingdom as Brigadier General, General Staff (BGGS) to Major General James Whiteside McCay. McCay was known as a hard task master, but he had nothing but praise for the work of Gellibrand, who helped him overhaul the organisation and the training syllabus. Likewise, Gellibrand held McCay in high regard. Gellibrand returned to the Western Front on 14 November 1917, taking over command of the 12th Infantry Brigade vice Brigadier General James Campbell Robertson, who was returning to Australia on leave. He soon placed his own distinctive stamp on his new command. In April 1918, the brigade was committed to battle in the path of the advancing German Army in the Battle of Dernancourt. The brigade held and defeated the German advance. On 30 May 1918, Major General John Monash was appointed to command the Australian Corps, and Birdwood selected Gellibrand to take Monash's place in command of the 3rd Division. Gellibrand was promoted to major general on 1 June 1918. He found the 3rd Division a difficult assignment. The division staff had been together for two years, and were accustomed to Monash. Other brigadier generals were understandably disappointed at missing out on a division command, particularly Walter McNicoll. At the Battle of Amiens, Monash and Gellibrand had serious disagreements over tactics and troop dispositions. Gellibrand disliked part of the plan that called for the leapfrogging of divisions, generally regarded as Monash's master stroke. Monash overruled him. On 27 September 1918, the two